Current Search: Task Performance (x)
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(1 - 7 of 7)
- Title
- THE EFFECTS OF SECONDARY TASK DEMANDON THE ASSESSMENT OF THREAT.
- Creator
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Ganey, Harriss, Hancock, Peter, University of Central Florida
- Abstract / Description
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Threat perception is an important issue in today's world. As the line between hostile and non-hostile entities is blurred, it becomes more important for individuals to clearly distinguish between those who would present danger and those who would not. This series of experiments tested whether observers engaged in a dual-task paradigm perceived a greater amount of threat from target stimuli than they did when they were engaged in the threat task alone. The first experiment revealed that...
Show moreThreat perception is an important issue in today's world. As the line between hostile and non-hostile entities is blurred, it becomes more important for individuals to clearly distinguish between those who would present danger and those who would not. This series of experiments tested whether observers engaged in a dual-task paradigm perceived a greater amount of threat from target stimuli than they did when they were engaged in the threat task alone. The first experiment revealed that observers rated targets as more threatening when they were engaged in the additional task than when they only rated the targets themselves. Response time to the targets was also slower when a secondary task was present. This difference was more pronounced when the secondary task was presented via the auditory channel. Participants also rated overall workload higher when performing a secondary task, with the highest ratings being associated with the dual-task auditory condition. In the second experiment, the design crossed sensory modality with the presence or non-presence of threat. Inter-stimulus interval was also manipulated. The presence of threat was associated with faster response times, though when both tasks had threat components, response time was not the fastest. Additionally, when images came first in the stimulus pairs, observers were slower to respond to the first stimulus than when the sounds were presented first. Results supported the conclusion that additional task loading can affect the perception of threat. The modality of the additional task seems to also play a role in threat assessment performance. Results also led to the conclusion that threat-related visual stimuli are more challenging to process than threat-related auditory stimuli. Future research can now investigate how different types of tasks affect the threat perception task. Implications for better training of soldiers and for the design of automated systems are presented.
Show less - Date Issued
- 2006
- Identifier
- CFE0001156, ucf:46864
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0001156
- Title
- THE EFFECTS ON OPERATOR PERFORMANCE AND WORKLOAD WHEN GUNNERY AND ROBOTIC CONTROL TASKS ARE PERFORMED CONCURRENTLY.
- Creator
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Joyner, Carla, McCauley-Bell, Pamela, University of Central Florida
- Abstract / Description
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The purpose of this research was to examine operator workload and performance in a high risk, multi-task environment. Specifically, the research examined if a gunner of a Future Combat System, such as a Mounted Combat System, could effectively detect targets in the immediate environment while concurrently operating robotic assets in a remote environment. It also analyzed possible effects of individual difference factors, such as spatial ability and attentional control, on operator performance...
Show moreThe purpose of this research was to examine operator workload and performance in a high risk, multi-task environment. Specifically, the research examined if a gunner of a Future Combat System, such as a Mounted Combat System, could effectively detect targets in the immediate environment while concurrently operating robotic assets in a remote environment. It also analyzed possible effects of individual difference factors, such as spatial ability and attentional control, on operator performance and workload. The experimental conditions included a gunner baseline and concurrent task conditions where participants simultaneously performed gunnery tasks and one of the following tasks: monitor an unmanned ground vehicle (UGV) via a video feed (Monitor), manage a semi-autonomous UGV, and teleoperate a UGV (Teleop). The analysis showed that the asset condition significantly impacted gunnery performance with the gunner baseline having the highest number of targets detected (M = 13.600 , SD = 2.353), and concurrent Teleop condition the lowest (M = 9.325 , SD = 2.424). The research also found that high spatial ability participants tended to detect more targets than low spatial ability participants. Robotic task performance was also affect by the asset condition. The results showed that the robotic target detection rate was lower for the concurrent task conditions. A significant difference was seen between the UGV-baseline (80.1%) when participants performed UGV tasks only and UGV-concurrent conditions (67.5%) when the participants performed UGV tasks concurrently with gunnery tasks. Overall, this study revealed that there were performance decrements for the gunnery tasks as well as the robotic tasks when the tasks were performed concurrently.
Show less - Date Issued
- 2006
- Identifier
- CFE0000979, ucf:46704
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0000979
- Title
- IMPROVING THE ADVERSE IMPACT AND VALIDITY TRADE-OFF IN PARAETO OPTIMAL COMPOSITES: A COMPARISON OF WEIGHTS DEVELOPED ON CONTEXTUAL VS TASK PERFORMANCE.
- Creator
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Tsang, Howin, Wooten, William, University of Central Florida
- Abstract / Description
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Recent research in reducing adverse impact in personnel selection has focused on the use of various weighting schemes to balance levels of adverse impact and the validity of selection processes. De Corte Lievens & Sackett (2007) suggested the use of the normal boundary intersection method to create a number of weights that optimize adverse impact and criterion validity. This study seeks to improve the efficacy of this solution by looking at specific types of performance, namely task and...
Show moreRecent research in reducing adverse impact in personnel selection has focused on the use of various weighting schemes to balance levels of adverse impact and the validity of selection processes. De Corte Lievens & Sackett (2007) suggested the use of the normal boundary intersection method to create a number of weights that optimize adverse impact and criterion validity. This study seeks to improve the efficacy of this solution by looking at specific types of performance, namely task and contextual performance. It will investigate whether a focus on contextual performance will improve the trade-off by requiring smaller losses in validity for greater gains in adverse impact. This study utilized data from 272 applicants for exempt positions at a multinational financial institution. The two sets of Paraeto optimal composite were developed, one based on contextual performance and the other based on task performance. Results were analyzed based on levels of adverse impact and validity of weights generated using each method. Results indicate that reducing adverse impact required a greater validity trade-off for task performance than contextual performance. Application of this method would allow for greater reductions to adverse impact than the original method while retaining a validity coefficient of 95% of the maximum achieved with regression weighting. Though this method would limit practitioners to selecting based on contextual performance, the use of minimal cut-off scores on task predictors or job experience could allow employers to incorporate task measures while further reducing adverse impact.
Show less - Date Issued
- 2010
- Identifier
- CFE0003399, ucf:48386
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0003399
- Title
- An Agent Based Model to assess crew temporal variability during U.S. Navy shipboard operations.
- Creator
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Muhs, Kevin, Karwowski, Waldemar, Elshennawy, Ahmad, Hancock, Peter, Sjoden, Glenn, University of Central Florida
- Abstract / Description
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Understanding the factors that affect human performance variability as well as their temporal impacts is an essential element in fully integrating and designing complex, adaptive environments. This understanding is particularly necessary for high stakes, time-critical routines such as those performed during nuclear reactor, air traffic control, and military operations. Over the last three decades significant efforts have emerged to demonstrate and apply a host of techniques to include...
Show moreUnderstanding the factors that affect human performance variability as well as their temporal impacts is an essential element in fully integrating and designing complex, adaptive environments. This understanding is particularly necessary for high stakes, time-critical routines such as those performed during nuclear reactor, air traffic control, and military operations. Over the last three decades significant efforts have emerged to demonstrate and apply a host of techniques to include Discrete Event Simulation, Bayesian Belief Networks, Neural Networks, and a multitude of existing software applications to provide relevant assessments of human task performance and temporal variability. The objective of this research was to design and develop a novel Agent Based Modeling and Simulation (ABMS) methodology to generate a timeline of work and assess impacts of crew temporal variability during U.S. Navy Small Boat Defense operations in littoral waters.The developed ABMS methodology included human performance models for six crew members (agents) as well as a threat craft, and incorporated varying levels of crew capability and task support. AnyLogic ABMS software was used to simultaneously provide detailed measures of individual sailor performance and of system-level emergent behavior. This methodology and these models were adapted and built to assure extensibility across a broad range of U.S. Navy shipboard operations.Application of the developed ABMS methodology effectively demonstrated a way to visualize and quantify impacts/uncertainties of human temporal variability on both workload and crew effectiveness during U.S. Navy shipboard operations.
Show less - Date Issued
- 2018
- Identifier
- CFE0007592, ucf:52549
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0007592
- Title
- Investigating the relationships between preferences, gender, and high school students' geometry performance.
- Creator
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Mainali, Bhesh, Haciomeroglu, Erhan, Dixon, Juli, Andreasen, Janet, Bai, Haiyan, University of Central Florida
- Abstract / Description
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In this quantitative study, the relationships between high school students' preference for solution methods, geometry performance, task difficulty, and gender were investigated. The data was collected from 161 high school students from six different schools at a county located in central Florida in the United States. The study was conducted during the 2013(-)2014 school year. The participants represented a wide range in socioeconomic status, were from a range of grades (10-12), and were...
Show moreIn this quantitative study, the relationships between high school students' preference for solution methods, geometry performance, task difficulty, and gender were investigated. The data was collected from 161 high school students from six different schools at a county located in central Florida in the United States. The study was conducted during the 2013(-)2014 school year. The participants represented a wide range in socioeconomic status, were from a range of grades (10-12), and were enrolled in different mathematics courses (Algebra 2, Geometry, Financial Algebra, and Pre-calculus). Data were collected primarily with the aid of a geometry test and a geometry questionnaire. Using a think-aloud protocol, a short interview was also conducted with some students.For the purpose of statistical analysis, students' preferences for solution methods were quantified into numeric values, and then a visuality score was obtained for each student. Students' visuality scores ranged from -12 to +12. The visuality scores were used to assess students' preference for solution methods. A standardized test score was used to measure students' geometry performance. The data analysis indicated that the majority of students were visualizers. The statistical analysis revealed that there was not an association between preference for solution methods and students' geometry performance. The preference for solving geometry problems using either visual or nonvisual methods was not influenced by task difficulty. Students were equally likely to employ visual as well as nonvisual solution methods regardless of the task difficulty. Gender was significant in geometry performance but not in preference for solution methods. Female students' geometry performance was significantly higher than male students' geometry performance. The findings of this study suggested that instruction should be focused on incorporating both visual and nonvisual teaching strategies in mathematics lesson activities in order to develop preference for both visual and nonvisual solution methods.
Show less - Date Issued
- 2014
- Identifier
- CFE0005374, ucf:50448
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005374
- Title
- Impacts of Complexity and Timing of Communication Interruptions on Visual Detection Tasks.
- Creator
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Stader, Sally, Mouloua, Mustapha, Hancock, Peter, Neider, Mark, Kincaid, John, University of Central Florida
- Abstract / Description
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Auditory preemption theory suggests two competing assumptions for the attention-capturing and performance-altering properties of auditory tasks. In onset preemption, attention is immediately diverted to the auditory channel. Strategic preemption involves a decision process in which the operator maintains focus on more complex auditory messages. The limitation in this process is that the human auditory, or echoic, memory store has a limit of 2 to 5 seconds, after which the message must be...
Show moreAuditory preemption theory suggests two competing assumptions for the attention-capturing and performance-altering properties of auditory tasks. In onset preemption, attention is immediately diverted to the auditory channel. Strategic preemption involves a decision process in which the operator maintains focus on more complex auditory messages. The limitation in this process is that the human auditory, or echoic, memory store has a limit of 2 to 5 seconds, after which the message must be processed or it decays. In contrast, multiple resource theory suggests that visual and auditory tasks may be efficiently time-shared because two different pools of cognitive resources are used. Previous research regarding these competing assumptions has been limited and equivocal. Thus, the current research focused on systematically examining the effects of complexity and timing of communication interruptions on visual detection tasks. It was hypothesized that both timing and complexity levels would impact detection performance in a multi-task environment. Study 1 evaluated the impact of complexity and timing of communications occurring before malfunctions in an ongoing visual detection task. Twenty-four participants were required to complete each of the eight timing blocks that included simple or complex communications occurring simultaneously, and at 2, 5, or 8 seconds before detection events. For simple communications, participants repeated three pre-recorded words. However, for complex communications, they generated three words beginning with the same last letter of a word prompt. Results indicated that complex communications at two seconds or less occurring before a visual detection event significantly impacted response time with a 1.3 to 1.6 second delay compared to all the other timings. Detection accuracy for complex communication tasks under the simultaneous condition was significantly degraded compared to simple communications at five seconds or more prior to the task. This resulted in a 20% decline in detection accuracy. Additionally, participants' workload ratings for complex communications were significantly higher than simple communications. Study 2 examined the timing of communications occurring at the corresponding seconds after the visual detection event. Twenty-four participants were randomly assigned to the communication complexity and timing blocks as in study 1. The results did not find significant performance effects of timing or complexity of communications on detection performance. However the workload ratings for the 2 and 5 second complex communication presentations were higher compared to the same simple communication conditions. Overall, these findings support the strategic preemption assumption for well-defined, complex communications. The onset preemption assumption for simple communications was not supported. These results also suggest that the boundaries of the multiple resource theory assumption may exist up to the limits of the echoic memory store. Figures of merit for task performance under the varying levels of timing and complexity are presented. Several theoretical and practical implications are discussed.
Show less - Date Issued
- 2014
- Identifier
- CFE0005420, ucf:50415
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005420
- Title
- Not Woman Enough Harassment: Scale Development and an Integrated Model from Antecedent to Outcome.
- Creator
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Wolcott, Amanda, Jentsch, Kimberly, Jentsch, Florian, Shoss, Mindy, Lopez, Stephanie, University of Central Florida
- Abstract / Description
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The rise of research on workplace mistreatment in the past twenty years can be attributed to the realization that workplace mistreatment is associated with a host of deleterious outcomes for both the individual targets of the mistreatment and the organizations in which they work. However, the extant literature is failing to capture the full range of sex-based mistreatment that people may experience through a tendency to focus solely on sexual harassment and sex discrimination, which are very...
Show moreThe rise of research on workplace mistreatment in the past twenty years can be attributed to the realization that workplace mistreatment is associated with a host of deleterious outcomes for both the individual targets of the mistreatment and the organizations in which they work. However, the extant literature is failing to capture the full range of sex-based mistreatment that people may experience through a tendency to focus solely on sexual harassment and sex discrimination, which are very specific types of behavior based on one's sex and gender stereotypes. In this dissertation, I introduce the construct of Not Woman Enough Harassment, or the extent to which women perceive that they are treated unfavorably because they do not meet traditionally held stereotypes of femininity. A scale was developed and validated in order to measure this type of harassment, and a model from antecedent to outcome was proposed. Results demonstrated that not woman enough harassment was experienced by approximately 32.5% of the sample. The scale showed good psychometric properties, with two distinct factors of harassment based on physical and non-physical traits. Not woman enough harassment was demonstrated to be distinct from other forms of sexual and workplace harassment. Discomfort with gender norm conformity and masculine physical and non-physical expression were shown to be antecedents of not woman enough harassment, along with a moderating effect of job gender context. In addition, not woman enough harassment significantly predicted decreased job satisfaction, affective organizational commitment, and task performance and increased withdrawal and job stress. Similar patterns were found for males with not man enough harassment.
Show less - Date Issued
- 2017
- Identifier
- CFE0006962, ucf:51629
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006962
