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Title: TEXT VERSUS VERBAL REAL-TIME FEEDBACK DURING SIMULATION-BASED TRAINING OF HIGHER-ORDER COGNITIVE SKILLS.
Creator: Fiorella, Christopher, Shumaker, Randall, University of Central Florida
Abstract / Description: A crucial component of instructional design for simulation-based training systems involves optimizing the presentation of complex material in order to maximize knowledge acquisition and application. One approach toward facilitating the learning of this complex information is to instantiate instructional strategies within the training systems themselves. However, there are few established guidelines in place which are meant specifically for real-time guidance strategies within simulation-based...
Show moreA crucial component of instructional design for simulation-based training systems involves optimizing the presentation of complex material in order to maximize knowledge acquisition and application. One approach toward facilitating the learning of this complex information is to instantiate instructional strategies within the training systems themselves. However, there are few established guidelines in place which are meant specifically for real-time guidance strategies within simulation-based environments. Consequently, this study aims to apply findings from the literature on instructional information presentation to drive decisions for how to most effectively provide real-time feedback during training of simulated decision-making tasks. Research has shown that presenting text information in an auditory mode during direct instruction of operational tasks enhances learning and reduces the probability of learners experiencing cognitive overload. Similar effects have been found regarding the presentation modality of feedback during operational tasks. In the current study, this principle was extended by comparing text versus verbal real-time feedback presentation during learning of higher-level cognitive skills in a virtual environment. Participants were instructed on how to perform a simulated decision-making task, while receiving text, verbal or no instructional feedback in real-time, based on their performance. Participants then completed an assessment scenario in which no feedback was provided to any group. It was hypothesized that a linear relationship would exist across each of the three conditions, with the verbal group making the best decisions, followed by the text group, and then by the control group. Additionally, reduced cognitive load was expected throughout the instructional process for those receiving verbal feedback prompts compared to those receiving text prompts and the control. Analyses revealed several significant linear trends across conditions regarding measures of knowledge acquisition and application. The results provide support for the hypothesis that verbal real-time feedback is more effective than text during training of primarily visual tasks for the acquisition of higher-order cognitive skills such as decision making. There were no significant linear trends regarding the amount of cognitive load subjectively reported during training and assessment. The results of this study indicate that instructional systems intended to train primarily visual tasks should present real-time feedback in verbal rather than text form.
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Date Issued: 2010
Identifier: CFE0003555, ucf:48915
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0003555

Title: The utility of verbal display redundancy in managing pilot's cognitive load during controller-pilot voice communications.
Creator: Kratchounova, Daniela, Jentsch, Florian, Mouloua, Mustapha, Hancock, Peter, Wise, John, University of Central Florida
Abstract / Description: Miscommunication between controllers and pilots, potentially resulting from a high pilot cognitive load, has been a causal or contributing factor in a large number of aviation accidents. In this context, failure to communicate can be attributed, among other factors, to an inadequate human-system interface design, the related high cognitive load imposed on the pilot, and poor performance reflected by a higher error rate. To date, voice radio remains in service without any means for managing...
Show moreMiscommunication between controllers and pilots, potentially resulting from a high pilot cognitive load, has been a causal or contributing factor in a large number of aviation accidents. In this context, failure to communicate can be attributed, among other factors, to an inadequate human-system interface design, the related high cognitive load imposed on the pilot, and poor performance reflected by a higher error rate. To date, voice radio remains in service without any means for managing pilot cognitive load by design (as opposed to training or procedures). Such an oversight is what prompted this dissertation. The goals of this study were (a) to investigate the utility of a voice-to-text transcription (V-T-T) of ATC clearances in managing pilot's cognitive load during controller-pilot communications within the context of a modern flight deck environment, and (b) to validate whether a model of variable relationships which is generated in the domain of learning and instruction would (")transfer("), and to what extend, to an operational domain. First, within the theoretical framework built for this dissertation, all the pertaining factors were analyzed. Second, by using the process of synthesis, and based on guidelines generated from that theoretical framework, a redundant verbal display of ATC clearances (i.e., a V-T-T) was constructed. Third, the synthesized device was empirically examined. Thirty four pilots participated in the study (-) seventeen pilots with 100-250 total flight hours and seventeen with (>)500 total flight hours. All participants had flown within sixty days prior to attending the study. The experiment was conducted one pilot at a time in 2.5-hour blocks. A 2 Verbal Display Redundancy (no-redundancy and redundancy) X 2 Verbal Input Complexity (low and high) X 2 Level of Expertise (novices and experts) mixed-model design was used for the study with 5 IFR clearances in each Redundancy X Complexity condition. The results showed that the amounts of reduction of cognitive load and improvement of performance, when verbal display redundancy was provided, were in the range of about 20%. These results indicated that V-T-T is a device which has a tremendous potential to serve as (a) a pilot memory aid, (b) a way to verify a clearance has been captured correctly without having to make a (")Say again(") call, and (c) to ultimately improve the margin of safety by reducing the propensity for human error for the majority of pilot populations including those with English as a second language. Fourth, the results from the validation of theoretical models (")transfer(") showed that although cognitive load remained as a significant predictor of performance, both complexity and redundancy also had unique significant effects on performance. Furthermore, these results indicated that the relationship between these variables was not as (")clear-cut(") in the operational domain investigated here as the models from the domain of learning and instruction suggested. Until further research is conducted, (a) to investigate how changes in the operational task settings via adding additional coding (e.g., permanent record of clearances which can serve as both a memory aid and a way to verify a clearance is captured correctly) affect performance through mechanisms other than cognitive load; and (b) unless the theoretical models are modified to reflect how changes in the input variables impact the outcome in a variety of ways; a degree of prudence should be exercised when the results from the model (")transfer(") validation are applied to operational environments similar to the one investigated in this dissertation research.
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Date Issued: 2012
Identifier: CFE0004251, ucf:49504
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004251

Title: Simulation-Based Cognitive Workload Modeling and Evaluation of Adaptive Automation Invoking and Revoking Strategies.
Creator: Rusnock, Christina, Geiger, Christopher, Karwowski, Waldemar, Xanthopoulos, Petros, Reinerman, Lauren, University of Central Florida
Abstract / Description: In human-computer systems, such as supervisory control systems, large volumes of incoming and complex information can degrade overall system performance. Strategically integrating automation to offload tasks from the operator has been shown to increase not only human performance but also operator efficiency and safety. However, increased automation allows for increased task complexity, which can lead to high cognitive workload and degradation of situational awareness. Adaptive automation is...
Show moreIn human-computer systems, such as supervisory control systems, large volumes of incoming and complex information can degrade overall system performance. Strategically integrating automation to offload tasks from the operator has been shown to increase not only human performance but also operator efficiency and safety. However, increased automation allows for increased task complexity, which can lead to high cognitive workload and degradation of situational awareness. Adaptive automation is one potential solution to resolve these issues, while maintaining the benefits of traditional automation. Adaptive automation occurs dynamically, with the quantity of automated tasks changing in real-time to meet performance or workload goals. While numerous studies evaluate the relative performance of manual and adaptive systems, little attention has focused on the implications of selecting particular invoking or revoking strategies for adaptive automation. Thus, evaluations of adaptive systems tend to focus on the relative performance among multiple systems rather than the relative performance within a system.This study takes an intra-system approach specifically evaluating the relationship between cognitive workload and situational awareness that occurs when selecting a particular invoking-revoking strategy for an adaptive system. The case scenario is a human supervisory control situation that involves a system operator who receives and interprets intelligence outputs from multiple unmanned assets, and then identifies and reports potential threats and changes in the environment. In order to investigate this relationship between workload and situational awareness, discrete event simulation (DES) is used. DES is a standard technique in the analysis of systems, and the advantage of using DES to explore this relationship is that it can represent a human-computer system as the state of the system evolves over time. Furthermore, and most importantly, a well-designed DES model can represent the human operators, the tasks to be performed, and the cognitive demands placed on the operators. In addition to evaluating the cognitive workload to situational awareness tradeoff, this research demonstrates that DES can quite effectively model and predict human cognitive workload, specifically for system evaluation.This research finds that the predicted workload of the DES models highly correlates with well-established subjective measures and is more predictive of cognitive workload than numerous physiological measures. This research then uses the validated DES models to explore and predict the cognitive workload impacts of adaptive automation through various invoking and revoking strategies. The study provides insights into the workload-situational awareness tradeoffs that occur when selecting particular invoking and revoking strategies. First, in order to establish an appropriate target workload range, it is necessary to account for both performance goals and the portion of the workload-performance curve for the task in question. Second, establishing an invoking threshold may require a tradeoff between workload and situational awareness, which is influenced by the task's location on the workload-situational awareness continuum. Finally, this study finds that revoking strategies differ in their ability to achieve workload and situational awareness goals. For the case scenario examined, revoking strategies based on duration are best suited to improve workload, while revoking strategies based on revoking thresholds are better for maintaining situational awareness.
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Date Issued: 2013
Identifier: CFE0004927, ucf:49607
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004927

Title: The relationship between caregiver intimate partner violence, posttraumatic stress, child cognitive self-development, and treatment attrition among child sexual abuse victims.
Creator: Delorenzi, Leigh, Daire, Andrew, Young, Mark, Lambie, Glenn, Abel, Eileen, University of Central Florida
Abstract / Description: Child sexual abuse (CSA) is a worldwide problem, with two-thirds of all cases going unreported. A wealth of research over the last 30 years demonstrates the negative emotional, cognitive, physical, spiritual, academic, and social effects of CSA. As a result, researchers and mental health professionals frequently attempt to measure the efficacy of treatment modalities in order to assess which treatments lead to better outcomes. However, in order to effectively study treatment outcomes,...
Show moreChild sexual abuse (CSA) is a worldwide problem, with two-thirds of all cases going unreported. A wealth of research over the last 30 years demonstrates the negative emotional, cognitive, physical, spiritual, academic, and social effects of CSA. As a result, researchers and mental health professionals frequently attempt to measure the efficacy of treatment modalities in order to assess which treatments lead to better outcomes. However, in order to effectively study treatment outcomes, researchers must be able to track the status of child functioning and symptomology before, during, and after treatment. Because high levels of treatment attrition exist among CSA victims, researchers are unable to effectively study outcomes due to large losses in research participants, loss of statistical power, and threats to external validity (Kazdin, 1990). Moreover, due to the high prevalence of concurrent family violence, caregivers with intimate partner violence are more than twice as likely to have children who are also direct victims of abuse (Kazdin, 1996). Caregivers ultimately make the decisions regarding whether or not a child stays in treatment, and therefore, it is important to examine the influence of both parent factors (e.g., intimate partner violence) and child factors (e.g., traumatization and/or disturbances in cognitive self-development) on treatment attrition. This two-pronged approach of examining both child and family characteristics simultaneously with attrition patterns offers a more complete picture for the ways concurrent family violence influences treatment than looking at child and caregiver factors separately.The purpose of this study was to investigate the relationships between caregiver intimate partner violence, child posttraumatic stress (Trauma Symptom Checklist for Children [TSCC]; Briere, 1996), child cognitive self-development (Trauma and Attachment Belief Scale [TABS]; Pearlman, 2003), and treatment attrition. The statistical analyses in this study included (a) Logistic Regression, (b) Poisson Regression, and (c) Chi-square Test for Independence. Elevated TSCC subscale scores in posttraumatic stress predicted both an increased number of sessions attended and increased number of sessions missed. Elevated TABS subscale scores in self-trust predicted an increased number of sessions attended and decreased number of sessions missed. Elevated TABS subscale scores of other-intimacy and self-control predicted an increased number of sessions missed. Moreover, the presence of past or current caregiver intimate partner violence predicted a decrease in number of sessions attended. While no relationship existed between child posttraumatic stress or cognitive self-development and whether a child graduated or prematurely terminated from treatment, children with parents who confirmed past or current intimate partner violence were 2.5 times more likely to prematurely terminate from treatment.
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Date Issued: 2012
Identifier: CFE0004369, ucf:49439
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004369

Title: Gifted Students' Engagement in a Middle School Research and Critical Thinking Course.
Creator: Crupi, Samuel, Jeanpierre, Bobby, Gresham, Regina, Haciomeroglu, Erhan, University of Central Florida
Abstract / Description: This action research was an analysis of a group of eighth grade gifted students 'classroom engagement in a large urban school district. Over a two-week period a variety of data were collected. Data were collected using the Student Engagement Instrument (Appleton (&) Christenson, 2004), which is a self-report of students' perceptions of engagement. Observation data of student engagement were collected using a teacher developed student engagement checklist, which measured academic and...
Show moreThis action research was an analysis of a group of eighth grade gifted students 'classroom engagement in a large urban school district. Over a two-week period a variety of data were collected. Data were collected using the Student Engagement Instrument (Appleton (&) Christenson, 2004), which is a self-report of students' perceptions of engagement. Observation data of student engagement were collected using a teacher developed student engagement checklist, which measured academic and behavioral indications of student engagement. At the end of the two week observation period students participated in an exit interview focused on their perceptions of student engagement. The student engagement interview was adapted from an analysis of elementary student engagement carried out by Parn (2006). The data collected were analyzed according to the academic, behavioral, cognitive, and affective engagement sub-types. The findings showed that the highest levels of engagement were in the sub-types of behavioral and academic engagement. Levels of affective/psychological engagement were lower than levels of cognitive engagement. The results demonstrated that affective/psychological student engagement was positively related with cognitive engagement, behavioral engagement, and academic engagement.
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Date Issued: 2012
Identifier: CFE0004313, ucf:49466
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004313

Title: AN ANALYSIS OF TRAUMA NARRATIVES: PERCEPTIONS OF CHILDREN ON THE EXPERIENCE OF SEXUAL ABUSE.
Creator: Foster, Jennifer, Hagedorn, W. Bryce, University of Central Florida
Abstract / Description: Child sexual abuse (CSA) is estimated to affect 1 in 4 girls and 1 in 6 boys before the age of 18 (Centers for Disease Control and Prevention, 2005). Despite the prevalence of sexual abuse and frequent negative outcomes for child victims as well as adult survivors, little is known about CSA from the perspective of the child. To date, the vast majority of research has targeted adults. Studies conducted on children are mostly quantitative and have explored the effectiveness of various treatment...
Show moreChild sexual abuse (CSA) is estimated to affect 1 in 4 girls and 1 in 6 boys before the age of 18 (Centers for Disease Control and Prevention, 2005). Despite the prevalence of sexual abuse and frequent negative outcomes for child victims as well as adult survivors, little is known about CSA from the perspective of the child. To date, the vast majority of research has targeted adults. Studies conducted on children are mostly quantitative and have explored the effectiveness of various treatment interventions. To address the gap in the research literature, the present study investigated the perspectives of children on sexual abuse through thematic analysis of trauma narratives, which were written by children as a therapeutic intervention and described life prior to, during, and following sexual abuse. Analysis of 21 trauma narratives selected through purposive sampling revealed one meta-theme, which was titled Fear and Safety. Children's descriptions of past and current fears as well as concerns about their safety and the safety of others were evident throughout all sections of the narratives. Three themes also emerged from the analysis: (1) Memories of the Abuse, (2) The Disclosure and Subsequent Events, and (3) The Healing Journey. The first theme, Memories of the Abuse, included three subthemes: descriptions of the sexual abuse, details about the perpetrators, and children's thoughts and feelings about the abuse. The second theme, The Disclosure and Subsequent Events, included three subthemes: perceptions of the abuse disclosure, experiences during the investigation, and experiences with the justice system. The third theme, The Healing Journey, also resulted in three subthemes: experiences in counseling, how life had changed, and future hopes and dreams. The themes are discussed, and ramifications for prevention efforts, treatment of child victims of sexual abuse, and counselor preparation are explored. Additionally, implications of the present study for counselors and community members are delineated. Finally, recommendations are made for future research with child victims of sexual abuse.
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Date Issued: 2011
Identifier: CFE0003748, ucf:48788
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0003748

Title: Is there a difference in learning styles of honors versus non-honors students as assessed by the GEFT?.
Creator: Hollister, Debra Lee, Kubala, Thomas, Education
Abstract / Description: University of Central Florida College of Education Thesis; The goal of this research was to find if there was a discernible difference in the preferred learning style of an honors student versus a non-honors student based on the Group Embedded Figures Test. Although many instructors use the lecture method to teach, it many not be the most productive tool for students to learn. The information from this study could be of help when an instructor is preparing to instruct a group of students in...
Show moreUniversity of Central Florida College of Education Thesis; The goal of this research was to find if there was a discernible difference in the preferred learning style of an honors student versus a non-honors student based on the Group Embedded Figures Test. Although many instructors use the lecture method to teach, it many not be the most productive tool for students to learn. The information from this study could be of help when an instructor is preparing to instruct a group of students in an honors, AP (advanced placement) or gifted class as to determine what activities would provide the best retention of material. The results of this study were analyzed to examine the variables of being an honors or non-honors student, gender, age, ethnicity, degree being pursued and being a full time or part time student. According to the Chi2 analysis, it was found that there is no one learning style that is preferred by students who take honors classes versus other students. It was also discovered that gender, age, ethnicity, degree being pursued and being either a full time or part time student did not impact preferred learning style for the students on the East Campus of Valencia Community College. Suggested use for this study would be to inform instructors and faculty that there is no one learning style preferred by the honors student. This information can not be reiterated enough to ensure that students are given many different types of opportunities to successfully accomplish their academic goals.
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Date Issued: 2001
Identifier: CFR0011946, ucf:53105
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFR0011946

Title: Dance Students at a two year college: Making Sense of their Academic, Cultural, and Social World.
Creator: Lopez, Benjamin, Cintron Delgado, Rosa, Owens, J. Thomas, Santana, Maria, Kim, Chan Ji, University of Central Florida
Abstract / Description: The purpose of this dissertation was to investigate the lived experiences of community college dance students. Previous research was examined to provide a more holistic picture of dancers during their college years and while in the workforce. The literature reviewed indicated that the emergence of dance as a field of study was controversial. Its beginnings were marked by debates concerning (a) the very definition of dance as a body of motion and a body of knowledge that includes a history and...
Show moreThe purpose of this dissertation was to investigate the lived experiences of community college dance students. Previous research was examined to provide a more holistic picture of dancers during their college years and while in the workforce. The literature reviewed indicated that the emergence of dance as a field of study was controversial. Its beginnings were marked by debates concerning (a) the very definition of dance as a body of motion and a body of knowledge that includes a history and a philosophy as asserted by Dimondstein (1985), (b) its legitimate place within the academy (the perception that university dance programs were vocational in nature with little academic value) as noted by Stinson (1990); and, more recently (c) the possibility of some resolution to make dance not only a performing art but an academic discipline in its own right (Savrami, 2012). The theoretical framework of social cognitive career theory was used but was modified to include only the tenets most frequently cited in the literature that directly influenced the career identity of dancers particularly in relation to their motivation to academically persist and graduate. The phenomenological analysis, in the tradition of Moustakas (1994) and Wertz (2005), produced an early thematic matrix of 18 codes that were reduced to six major themes: aspirations, academic commitment, emotional identification, anticipated outcome or career expectation, vicarious learning, and challenges. One of the major recommendations included conducting a longitudinal study focusing on how students navigate an unpredictable job market, including the discussion of issues of workforce preparation in the academic curriculum and major.
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Date Issued: 2017
Identifier: CFE0006617, ucf:51266
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006617

Title: The Mothers: An Exploration of Memory and Secondary Knowledge.
Creator: Battle, Taylor, Raimundi-Ortiz, Wanda, Harris, Christopher, Price, Mark, University of Central Florida
Abstract / Description: I consider the experiences of past generations of women in my family and my relationship to them. This body of work began with Bessie, a portrait of my father's mother. I painted it after attending her funeral. I did not have a meaningful relationship with either of my grandmothers. This led me to consider my right to portray them. My need to admit my incomplete memory and avoid the objectification of my subjects caused me to question my perspective. I wanted to memorialize these women to...
Show moreI consider the experiences of past generations of women in my family and my relationship to them. This body of work began with Bessie, a portrait of my father's mother. I painted it after attending her funeral. I did not have a meaningful relationship with either of my grandmothers. This led me to consider my right to portray them. My need to admit my incomplete memory and avoid the objectification of my subjects caused me to question my perspective. I wanted to memorialize these women to avoid their erasure. Through the progressive abstraction of these women's figures, I chase an honest representation of my understanding.
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Date Issued: 2016
Identifier: CFE0006072, ucf:50947
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006072

Title: Team Interaction Dynamics during Collaborative Problem Solving.
Creator: Wiltshire, Travis, Fiore, Stephen, Jentsch, Florian, Salas, Eduardo, Wiegand, Rudolf, University of Central Florida
Abstract / Description: This dissertation contributes an enhanced understanding of team cognition, in general, and collaborative problem solving (CPS), specifically, through an integration of methods that measure team interaction dynamics and knowledge building as it occurs during a complex CPS task. The need for better understanding CPS has risen in prominence as many organizations have increasingly worked to address complex problems requiring the combination of diverse sets of individual expertise to achieve...
Show moreThis dissertation contributes an enhanced understanding of team cognition, in general, and collaborative problem solving (CPS), specifically, through an integration of methods that measure team interaction dynamics and knowledge building as it occurs during a complex CPS task. The need for better understanding CPS has risen in prominence as many organizations have increasingly worked to address complex problems requiring the combination of diverse sets of individual expertise to achieve solutions for novel problems. Towards this end, the present research drew from theoretical and empirical work on Macrocognition in Teams that describes the knowledge coordination arising from team communications during CPS. It built from this by incorporating the study of team interaction during complex collaborative cognition. Interaction between team members in such contexts has proven to be inherently dynamic and exhibiting nonlinear patterns not accounted for by extant research methods. To redress this gap, the present research drew from work in cognitive science designed to study social and team interaction as a nonlinear dynamical system. CPS was examined by studying knowledge building and interaction processes of 43 dyads working on NASA's Moonbase Alpha simulation, a CPS task. Both non-verbal and verbal interaction dynamics were examined. Specifically, frame-differencing, an automated video analysis technique, was used to capture the bodily movements of participants and content coding was applied to the teams' communications to characterize their CPS processes. A combination of linear (i.e., multiple regression, t-test, and time-lagged cross-correlation analysis), as well as nonlinear analytic techniques (i.e., recurrence quantification analysis; RQA) were applied. In terms of the predicted interaction dynamics, it was hypothesized that teams would exhibit synchronization in their bodily movements and complementarity in their communications and further, that teams more strongly exhibiting these forms of coordination will produce better problem solving outcomes. Results showed that teams did exhibit a pattern of bodily movements that could be characterized as synchronized, but higher synchronization was not systematically related to performance. Further, results showed that teams did exhibit communicative interaction that was complementary, but this was not predictive of better problem solving performance. Several exploratory research questions were proposed as a way of refining the application of these techniques to the investigation of CPS. Results showed that semantic code-based communications time-series and %REC and ENTROPY recurrence-based measures were most sensitive to differences in performance. Overall, this dissertation adds to the scientific body of knowledge by advancing theory and empirical knowledge on the forms of verbal and non-verbal team interaction during CPS, but future work remains to be conducted to identify the relationship between interaction dynamics and CPS performance.
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Date Issued: 2015
Identifier: CFE0005907, ucf:50867
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005907

Title: Mental rotation: Can familiarity alleviate the effects of complex backgrounds?.
Creator: Selkowitz, Anthony, Sims, Valerie, Jentsch, Florian, Chin, Matthew, Cash, Mason, University of Central Florida
Abstract / Description: This dissertation investigated the effects of complex backgrounds on mental rotation. Stimulus familiarity and background familiarity were manipulated. It systematically explored how familiarizing participants to objects and complex backgrounds affects their performance on a mental rotation task involving complex backgrounds. This study had 113 participants recruited through the UCF Psychology SONA system. Participants were familiarized with a stimulus in a task where they were told to...
Show moreThis dissertation investigated the effects of complex backgrounds on mental rotation. Stimulus familiarity and background familiarity were manipulated. It systematically explored how familiarizing participants to objects and complex backgrounds affects their performance on a mental rotation task involving complex backgrounds. This study had 113 participants recruited through the UCF Psychology SONA system. Participants were familiarized with a stimulus in a task where they were told to distinguish the stimulus from 3 other stimuli. A similar procedure was used to familiarize the backgrounds. The research design was a 2 stimulus familiarity (Familiarized with the Target Stimulus, not familiarized with the Target Stimulus) by 2 background familiarity (Familiarized with Target Background, not familiarized with Target Background 1) by 2 stimulus response condition (Target Stimulus, Non-Target Stimulus) by 3 background response condition (Target Background, Non-Target Background, Blank Background) by 12 degree of rotation (0, 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330) mixed design. The study utilized target stimulus and target background familiarity conditions as the between-subjects variables. Background, stimulus, and degree of rotation were within-subjects variables. The participants' performance was measured using reaction time and percent of errors. Reaction time was computed using only the correct responses. After the familiarization task, participants engaged in a mental rotation task featuring stimuli and backgrounds that were present or not present in the familiarization task. A 2 (stimulus familiarization condition) by 2 (background familiarization condition) by 2 (stimulus response condition) by 3 (background response condition) by 12 (degree of rotation) mixed ANOVA was computed utilizing reaction time and percent of errors. Results suggest that familiarity with the Target Background had the largest effect on improving performance across response conditions. The results also suggest that familiarity with both the Target Stimulus and Target Background promoted inefficient mental rotation strategies which resulted in no significant differences between participants familiarized with neither the Target Stimulus nor the Target Background. Theoretical conclusions are drawn about stimulus familiarity and background familiarity. Future studies should investigate the effects of long term familiarity practice on mental rotation and complex backgrounds.
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Date Issued: 2015
Identifier: CFE0005998, ucf:50789
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005998

Title: Compressive Sensing and Recovery of Structured Sparse Signals.
Creator: Shahrasbi, Behzad, Rahnavard, Nazanin, Vosoughi, Azadeh, Wei, Lei, Atia, George, Pensky, Marianna, University of Central Florida
Abstract / Description: In the recent years, numerous disciplines including telecommunications, medical imaging, computational biology, and neuroscience benefited from increasing applications of high dimensional datasets. This calls for efficient ways of data capturing and data processing. Compressive sensing (CS), which is introduced as an efficient sampling (data capturing) method, is addressing this need. It is well-known that the signals, which belong to an ambient high-dimensional space, have much smaller...
Show moreIn the recent years, numerous disciplines including telecommunications, medical imaging, computational biology, and neuroscience benefited from increasing applications of high dimensional datasets. This calls for efficient ways of data capturing and data processing. Compressive sensing (CS), which is introduced as an efficient sampling (data capturing) method, is addressing this need. It is well-known that the signals, which belong to an ambient high-dimensional space, have much smaller dimensionality in an appropriate domain. CS taps into this principle and dramatically reduces the number of samples that is required to be captured to avoid any distortion in the information content of the data. This reduction in the required number of samples enables many new applications that were previously infeasible using classical sampling techniques.Most CS-based approaches take advantage of the inherent low-dimensionality in many datasets. They try to determine a sparse representation of the data, in an appropriately chosen basis using only a few significant elements. These approaches make no extra assumptions regarding possible relationships among the significant elements of that basis. In this dissertation, different ways of incorporating the knowledge about such relationships are integrated into the data sampling and the processing schemes.We first consider the recovery of temporally correlated sparse signals and show that using the time correlation model. The recovery performance can be significantly improved. Next, we modify the sampling process of sparse signals to incorporate the signal structure in a more efficient way. In the image processing application, we show that exploiting the structure information in both signal sampling and signal recovery improves the efficiency of the algorithm. In addition, we show that region-of-interest information can be included in the CS sampling and recovery steps to provide a much better quality for the region-of-interest area compared the rest of the image or video. In spectrum sensing applications, CS can dramatically improve the sensing efficiency by facilitating the coordination among spectrum sensors. A cluster-based spectrum sensing with coordination among spectrum sensors is proposed for geographically disperse cognitive radio networks. Further, CS has been exploited in this problem for simultaneous sensing and localization. Having access to this information dramatically facilitates the implementation of advanced communication technologies as required by 5G communication networks.
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Date Issued: 2015
Identifier: CFE0006392, ucf:51509
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006392

Title: Reliable Spectrum Hole Detection in Spectrum-Heterogeneous Mobile Cognitive Radio Networks via Sequential Bayesian Non-parametric Clustering.
Creator: Zaeemzadeh, Alireza, Rahnavard, Nazanin, Vosoughi, Azadeh, Qi, GuoJun, University of Central Florida
Abstract / Description: In this work, the problem of detecting radio spectrum opportunities in spectrum-heterogeneous cognitive radio networks is addressed. Spectrum opportunities are the frequency channels that are underutilized by the primary licensed users. Thus, by enabling the unlicensed users to detect and utilize them, we can improve the efficiency, reliability, and the flexibility of the radio spectrum usage. The main objective of this work is to discover the spectrum opportunities in time, space, and...
Show moreIn this work, the problem of detecting radio spectrum opportunities in spectrum-heterogeneous cognitive radio networks is addressed. Spectrum opportunities are the frequency channels that are underutilized by the primary licensed users. Thus, by enabling the unlicensed users to detect and utilize them, we can improve the efficiency, reliability, and the flexibility of the radio spectrum usage. The main objective of this work is to discover the spectrum opportunities in time, space, and frequency domains, by proposing a low-cost and practical framework. Spectrum-heterogeneous networks are the networks in which different sensors experience different spectrum opportunities. Thus, the sensing data from sensors cannot be combined to reach consensus and to detect the spectrum opportunities. Moreover, unreliable data, caused by noise or malicious attacks, will deteriorate the performance of the decision-making process. The problem becomes even more challenging when the locations of the sensors are unknown. In this work, a probabilistic model is proposed to cluster the sensors based on their readings, not requiring any knowledge of location of the sensors. The complexity of the model, which is the number of clusters, is automatically inferred from the sensing data. The processing node, also referred to as the base station or the fusion center, infers the probability distributions of cluster memberships, channel availabilities, and devices' reliability in an online manner. After receiving each chunk of sensing data, the probability distributions are updated, without requiring to repeat the computations on previous sensing data. All the update rules are derived mathematically, by employing Bayesian data analysis techniques and variational inference.Furthermore, the inferred probability distributions are employed to assign unique spectrum opportunities to each of the sensors. To avoid interference among the sensors, physically adjacent devices should not utilize the same channels. However, since the location of the devices is not known, cluster membership information is used as a measure of adjacency. This is based on the assumption that the measurements of the devices are spatially correlated. Thus, adjacent devices, which experience similar spectrum opportunities, belong to the same cluster. Then, the problem is mapped into a energy minimization problem and solved via graph cuts. The goal of the proposed graph-theory-based method is to assign each device an available channel, while avoiding interference among neighboring devices. The numerical simulations illustrates the effectiveness of the proposed methods, compared to the existing frameworks.
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Date Issued: 2017
Identifier: CFE0006963, ucf:51639
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006963

Title: Visual Scanpath Training for Facial Affect Recognition in a Psychiatric Sample.
Creator: Chan, Chi, Bedwell, Jeffrey, Cassisi, Jeffrey, Sims, Valerie, University of Central Florida
Abstract / Description: Social cognition is essential for functional outcome and quality of life in psychiatric patients. Facial affect recognition (FAR), a domain of social cognition, is impaired in many patients with schizophrenia and bipolar disorder. There is evidence that abnormal visual scanpath patterns may underlie FAR deficits, and metacognitive factors may impact task performance. The present study aimed to develop a brief, individually-administered, computerized training program to normalize scanpath...
Show moreSocial cognition is essential for functional outcome and quality of life in psychiatric patients. Facial affect recognition (FAR), a domain of social cognition, is impaired in many patients with schizophrenia and bipolar disorder. There is evidence that abnormal visual scanpath patterns may underlie FAR deficits, and metacognitive factors may impact task performance. The present study aimed to develop a brief, individually-administered, computerized training program to normalize scanpath patterns in order to improve FAR in patient with a psychosis history or bipolar I disorder. The program was developed using scanpath data from 19 nonpsychiatric controls (NC) while they completed a FAR tasks that involved identification of mild or extreme intensity happy, sad, angry, and fearful faces, and a neutral expression. Patients were randomized to a waitlist (WG; n = 16) or training group (TG; n = 18). Both patient groups completed a baseline FAR task (T0), the training (or a repeated FAR task as a control for WG; T1), and a post-training FAR task (T2). Patients evaluated their own performance and eyetracking data were recorded. Results indicated that the patient groups did not differ from NC on FAR performance, metacognitive accuracy, or scanpath patterns at T0. TG was compliant with the training program and showed changes in scanpath patterns during T1, but returned to baseline scanpath patterns at T2. WG and TG did not differ at T2 on FAR performance, metacognitive accuracy, or scanpath patterns. Across both patient groups, FAR performance for mild intensity emotions were more sensitive to the effect of time than for extreme intensity emotions. Exploratory analysis showed that at baseline, greater severity of negative symptoms was associated with poorer metacognitive accuracy (i.e., accuracy in their evaluation of their performance). Limitations to the study and future directions are discussed.
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Date Issued: 2016
Identifier: CFE0006280, ucf:51613
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006280

Title: How does brief cognitive behavioral therapy work? Potential mechanisms of action for veterans with physical and psychological comorbidities.
Creator: Deavers, Frances, Cassisi, Jeffrey, Bowers, Clint, Eldridge, Gloria, University of Central Florida
Abstract / Description: Depression and anxiety are commonly comorbid among patients with chronic medical conditions. These comorbidities are associated with negative outcomes including poorer quality of life and worse physical functioning. Evidence that traditional cognitive behavioral therapy (CBT) is less effective for these populations has led to the development of brief CBT protocols that incorporate physical health self-management skills and are delivered in primary care. To continue refining treatment packages...
Show moreDepression and anxiety are commonly comorbid among patients with chronic medical conditions. These comorbidities are associated with negative outcomes including poorer quality of life and worse physical functioning. Evidence that traditional cognitive behavioral therapy (CBT) is less effective for these populations has led to the development of brief CBT protocols that incorporate physical health self-management skills and are delivered in primary care. To continue refining treatment packages, it is important to understand how brief CBT works. The present study used the transactional model of stress and coping as a framework for investigating potential mechanisms of action of brief CBT. Veterans with chronic obstructive pulmonary disease and/or heart failure and elevated symptoms of depression and/or anxiety were randomized to receive brief CBT (n =180) or enhanced usual care (EUC; n = 122). At 4-month follow-up, depression and anxiety symptoms were significantly lower in veterans who received brief CBT, compared to EUC. Multiple mediation analyses revealed that brief CBT was associated with higher self-efficacy and less avoidant coping at 4-month follow-up, which were in turn associated with less depression and anxiety symptoms. Illness intrusiveness was also a significant mediator of the relationship between brief CBT and anxiety symptoms, but not depression symptoms. In contrast, increases in active coping attributable to brief CBT were not associated with improvements in depression or anxiety symptoms. These results demonstrate the utility of the transactional model of stress and coping as a framework for understanding mechanisms of action of brief CBT in patients with comorbid physical and psychological conditions.
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Date Issued: 2017
Identifier: CFE0006733, ucf:51884
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006733

Title: Modeling Learner Mood in Realtime through Biosensors for Intelligent Tutoring Improvements.
Creator: Brawner, Keith, Gonzalez, Avelino, Boloni, Ladislau, Georgiopoulos, Michael, Proctor, Michael, Beidel, Deborah, University of Central Florida
Abstract / Description: Computer-based instructors, just like their human counterparts, should monitor the emotional and cognitive states of their students in order to adapt instructional technique. Doing so requires a model of student state to be available at run time, but this has historically been difficult. Because people are different, generalized models have not been able to be validated. As a person's cognitive and affective state vary over time of day and seasonally, individualized models have had differing...
Show moreComputer-based instructors, just like their human counterparts, should monitor the emotional and cognitive states of their students in order to adapt instructional technique. Doing so requires a model of student state to be available at run time, but this has historically been difficult. Because people are different, generalized models have not been able to be validated. As a person's cognitive and affective state vary over time of day and seasonally, individualized models have had differing difficulties. The simultaneous creation and execution of an individualized model, in real time, represents the last option for modeling such cognitive and affective states. This dissertation presents and evaluates four differing techniques for the creation of cognitive and affective models that are created on-line and in real time for each individual user as alternatives to generalized models. Each of these techniques involves making predictions and modifications to the model in real time, addressing the real time datastream problems of infinite length, detection of new concepts, and responding to how concepts change over time. Additionally, with the knowledge that a user is physically present, this work investigates the contribution that the occasional direct user query can add to the overall quality of such models. The research described in this dissertation finds that the creation of a reasonable quality affective model is possible with an infinitesimal amount of time and without (")ground truth(") knowledge of the user, which is shown across three different emotional states. Creation of a cognitive model in the same fashion, however, was not possible via direct AI modeling, even with all of the (")ground truth(") information available, which is shown across four different cognitive states.
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Date Issued: 2013
Identifier: CFE0004822, ucf:49734
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004822

Title: The influence of trait anxiety on information processing: An elaboration likelihood study.
Creator: Appelbaum, Michael, Miller, Ann, Weger, Harry, Rubenking, Bridget, University of Central Florida
Abstract / Description: This study explored the influence of trait anxiety on information processing in persuasive situations, and investigated cognitive load as a mediator of this relationship. The research presented was based off DeBono and McDermott's (1994) framework for exploring trait anxiety and persuasion. The theoretical lens used to explore information processing, the elaboration likelihood model (Petty (&) Cacioppo, 1986) posits that motivation and ability are necessary components to elaborate on a...
Show moreThis study explored the influence of trait anxiety on information processing in persuasive situations, and investigated cognitive load as a mediator of this relationship. The research presented was based off DeBono and McDermott's (1994) framework for exploring trait anxiety and persuasion. The theoretical lens used to explore information processing, the elaboration likelihood model (Petty (&) Cacioppo, 1986) posits that motivation and ability are necessary components to elaborate on a message. However, very little research has addressed ability variables like trait anxiety. I predicted that students high in trait anxiety would be persuaded by the attractiveness of the source (peripherally) whereas students low in trait anxiety would be persuaded by the strength of the arguments presented (centrally).Undergraduate students were asked to view a picture of a policy presenter and listen to a recording of the student's proposed policy statement. After listening to the recording participants wrote down their thoughts during the presentation and were tested on their ability to recall the arguments presented. They then completed a few scale items assessing their attitudes toward the policy as well as questions to maintain the cover story.Findings showed no difference in processing between low and high trait anxious individuals. However, there was a significant effect of anxiety on attitudes. Additionally, cognitive load was not found to be a mediator of the relationship between anxiety and attitudes.
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Date Issued: 2015
Identifier: CFE0005572, ucf:50262
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005572

Title: Examining the Influences of the Bottoming Out Experience and the Turning Point on the Early Recovery Process from Substance Dependence Using Structural Equation Modeling.
Creator: Depue, Mary, Hagedorn, William, Lambie, Glenn, Young, Mark, Conley, Abigail, Finch, Andrew, University of Central Florida
Abstract / Description: Considering the prevalence of addiction issues within the U.S., this study focused on the topic of recovery from drug and alcohol dependence in order to add to current literature. Prevention and recovery services are two of the most common ways of combating the addiction issue, and counselors are at the forefront of both movements. The bottoming out experience (BOE) and the turning point (TTP) are two common lay terms of factors within changing addictive behaviors, yet the connection of these...
Show moreConsidering the prevalence of addiction issues within the U.S., this study focused on the topic of recovery from drug and alcohol dependence in order to add to current literature. Prevention and recovery services are two of the most common ways of combating the addiction issue, and counselors are at the forefront of both movements. The bottoming out experience (BOE) and the turning point (TTP) are two common lay terms of factors within changing addictive behaviors, yet the connection of these constructs to recovery remains unstudied and unknown. The current study tested a model that levels of the BOE and the TTP are predictive of early recovery (ER).The data from this study was obtained from a national dataset previously collected from 230 grant-funded addiction treatment centers that utilize the Global Assessment of Individual Needs (GAIN) assessment instrument. A review of the literature gaps, coupled with available data, influenced decisions on research design and statistical analysis procedures. As clear definitions of the BOE, TTP, and ER have not been discovered through research, a descriptive, correlational research design was chosen in order to understand not only what constitutes a BOE, TTP, and ER, but also to discover the relationships between the BOE, TTP, and ER in their natural state. The purpose of correlational studies is to investigate the relationship between two or more variables without researcher manipulation and such designs are common in the counseling and counselor education research field (Heppner, et al., 2008). Because correlational research is exploratory in nature, structural equation modeling (SEM) was utilized to understand the components of each construct and was used to test the hypothesis of the relationships between the BOE, TTP and ER. Although SEM is a confirmatory technique, it is frequently used in an exploratory manner because it combines elements of confirmatory factor analysis and multiple regressions and allows for various possibilities of the relationships between constructs and variables (Schrieber, et al., 2006). The literature on ER, BOE, and TTP provides enough evidence to test a theoretical model, which is the purpose of SEM. The hypothesized model assessed data at intake for the BOE, TTP and ER. Once constructs were delineated through measurement models/CFA, SEM path analysis was used to understand how the constructs related to one another. The first three hypotheses were rejected in the study, and measurement model modifications were conducted, which yielded good fit indices. Results from Hypothesis One indicated that hypothesized factors did not load on the BOE, and instead, the BOE at the intake level was a measurement of mental health severity. Results from Hypothesis Two indicated that hypothesized factors did not load on TTP; however, TTP did resulting factor structure created through model modification contained factors of awareness, motivation, and support. Results from Hypothesis Three also indicated that hypothesized indicators did not load into ER; however the resulting factor structure contained indicators of abstinence and environmental support. Lastly, Hypothesis Four yielded three resulting models, all of which had good fit indices. Therefore, hypothesis four was accepted. It is noteworthy that direct effects were not all significant, and the p value in all final models was significant. There was not a significant relationship between the BOE and ER at the intake level; however, there was a significant relationship between the BOE and TTP, as well as TTP and ER at the intake level. The direct effects between the BOE and ER may have had a role in the significant p values, as well as the large sample size. Within the three resulting models, the BOE had significant relationships with TTP, spiritual support, and motivation. Both spiritual support and motivation also had significant relationships with ER. Therefore, the results from the current study support that there are existing relationships between the BOE and TTP; however, the relationship between the BOE and ER at the intake level was not significant.
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Date Issued: 2013
Identifier: CFE0004672, ucf:49862
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004672

Title: The Effect of Cognitively Guided Instruction on Students' Problem Solving Strategies and The Effect of Students' Use of Strategies on their Mathematics Achievement.
Creator: Sahin, Nesrin, Dixon, Juli, Haciomeroglu, Erhan, Ortiz, Enrique, Bai, Haiyan, Schoen, Robert, University of Central Florida
Abstract / Description: The purpose of this study was to investigate the effect of teachers attending Cognitively Guided Instruction (CGI) professional development on students' problem solving strategies and the effect of students' use of strategies on their mathematics achievement as measured by a standardized test. First, the study analyzed the differences in students' use of strategies between treatment and control groups. The treatment was CGI professional development, and the teachers in the treatment group...
Show moreThe purpose of this study was to investigate the effect of teachers attending Cognitively Guided Instruction (CGI) professional development on students' problem solving strategies and the effect of students' use of strategies on their mathematics achievement as measured by a standardized test. First, the study analyzed the differences in students' use of strategies between treatment and control groups. The treatment was CGI professional development, and the teachers in the treatment group attended CGI workshops whereas the teachers in the control group did not. Next, the study analyzed the differences in the mathematics achievement of students between different strategy groups. A student posttest, which was ITBS (Math Problems and Math Computation), was used to compare students' mathematics achievement. A student pretest was used as a covariate. The results of this study showed that there were statistically significant differences in the students' use of strategies between the treatment and control groups at the second grade level. A greater percentage of treatment students used derived facts / recall strategies (the most advanced strategy for single-digit addition and subtraction) than control students did. The results related to the effect of students' use of strategies on their mathematics achievement showed that the students who used derived facst/recall strategies for single-digit problems had significantly higher mathematics achievement than students who used counting or concrete modeling strategies. Furthermore, the students who used invented algorithms for multi-digit problems had significantly higher mathematics achievement than the students who used standard algorithms.
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Date Issued: 2015
Identifier: CFE0005704, ucf:50137
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005704

Title: Gestures and mental models: A triple coding hypothesis.
Creator: Austin, Maura, Gill, Michele, Sims, Valerie, Verkler, Karen, University of Central Florida
Abstract / Description: Gestures and speech have been intertwined since the beginning of human communication. Recently the role of gestures in cognition and learning has become a topic of interest in both cognitive and educational psychology. Some researchers have speculated that gestures inherently communicate information that is not provided in purely verbal communication, and that this supplemental information can lead to more thorough mental models in the receiver by acting on a physical/motor modality in...
Show moreGestures and speech have been intertwined since the beginning of human communication. Recently the role of gestures in cognition and learning has become a topic of interest in both cognitive and educational psychology. Some researchers have speculated that gestures inherently communicate information that is not provided in purely verbal communication, and that this supplemental information can lead to more thorough mental models in the receiver by acting on a physical/motor modality in addition to the two modalities proposed in the dual code hypothesis. To further understand this issue, in this study, we examined the effects of watching a gesturing or a non-gesturing lecturer on the learner's cognitive load and mental model development. The results have implications for cognitive psychology as well as educational psychology, particularly in multimedia learning.
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Date Issued: 2015
Identifier: CFE0005760, ucf:50083
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0005760

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