Current Search:  facial electromyography (x)

View All Items

  • CSV Spreadsheet
(1 - 3 of 3)
Measurement Of Negative Affectivity In Psychometrically Defined Schizotypy Using Facial Electromyography
Title
Measurement Of Negative Affectivity In Psychometrically Defined Schizotypy Using Facial Electromyography.
Creator
Mitchell, Jonathan, Cassisi, Jeffrey, Bedwell, Jeffrey, Beidel, Deborah, University of Central Florida
Abstract / Description
Schizotypy is a sub-threshold syndrome associated with schizophrenia. Much of the research on schizotypy concerns its component features, one of which being blunted or constricted affect. While several investigations have addressed this common (")negative(") symptom within the context of schizophrenia, few have focused on schizotypy directly, and none have utilized psychophysiological measurement to examine affective constriction. The present investigation uses facial electromyography (EMG)...
Show moreSchizotypy is a sub-threshold syndrome associated with schizophrenia. Much of the research on schizotypy concerns its component features, one of which being blunted or constricted affect. While several investigations have addressed this common (")negative(") symptom within the context of schizophrenia, few have focused on schizotypy directly, and none have utilized psychophysiological measurement to examine affective constriction. The present investigation uses facial electromyography (EMG) to measure patterns of affective expression within a psychometrically defined schizotypal population when presented threatening and distressing pictures from the IAPS. Twenty-eight individuals with elevated schizotypal features and 20 healthy controls were recruited for this investigation. The participants observed the series of pictures and provided self-report ratings of affective valance and arousal while their physiological responses were recorded. The protocol used here closely matched that used by Bradley and Lang (2007) and produced a similar pattern of results across all participants on self-reported ratings and physiological measures. Results further suggest that those with schizotypal features did not differ from control participants in self-reported ratings of negative affect or autonomic arousal. A three-way interaction in facial EMG measurement revealed that while schizotypic males demonstrated the expected pattern of blunted facial affective expression, schizotypic females displayed the opposite pattern. That is, females with psychometrically schizotypy demonstrated significant elevations in negative facial affective expression while viewing distressing pictures. We argue that these findings reflect unidentified sex differences in affective expression in schizotypy, and we discuss implications for assessment and diagnostic procedures among individuals with personality disorders.
Show less
Date Issued
2013
Identifier
CFE0004721, ucf:49808
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFE0004721
SUBTYPES OF ANHEDONIA AND FACIAL ELECTROMYOGRAPHYRESPONSE TO NEGATIVE AFFECTIVE PICTURES IN HEALTHY ADULTS
Title
SUBTYPES OF ANHEDONIA AND FACIAL ELECTROMYOGRAPHYRESPONSE TO NEGATIVE AFFECTIVE PICTURES IN HEALTHY ADULTS.
Creator
Kadison, Lisa, Bedwell, Jeffrey, University of Central Florida
Abstract / Description
Flat affect (i.e., diminished expressivity) and self-reported anhedonia (i.e., lack of pleasure) are associated with many psychiatric disorders. There is a need to examine the relationship between specific anhedonia subtypes and flat affect in a non-clinical sample. Forty-seven undergraduate students (59% male; mean age 20.37; SD = 4.74) completed self-report questionnaires assessing four subtypes of anhedonia - consummatory/anticipatory by social/non-social. Participants then viewed 15...
Show moreFlat affect (i.e., diminished expressivity) and self-reported anhedonia (i.e., lack of pleasure) are associated with many psychiatric disorders. There is a need to examine the relationship between specific anhedonia subtypes and flat affect in a non-clinical sample. Forty-seven undergraduate students (59% male; mean age 20.37; SD = 4.74) completed self-report questionnaires assessing four subtypes of anhedonia - consummatory/anticipatory by social/non-social. Participants then viewed 15 randomly-presented pictures (five neutral, ten negative) from the International Affective Pictures System while facial muscle activity (electromyography; EMG) was recorded. Male participants reporting a greater level of anhedonia, particularly consummatory social anhedonia, showed greater EMG activity change in the corrugator supercilii muscle to negative pictures, as compared with neutral pictures. Females showed the opposite pattern: more consummatory social anhedonia related to less EMG activity change in the corrugator muscle. In summary, consummatory social anhedonia in particular showed a strong relationship with facial expressivity that interacted with sex. In the presence of more consummatory social anhedonia, males show more negative facial reactions to negative stimuli while females show a more flattened affect. These findings may help explain discrepancies in existing research examining anhedonia and flat affect in clinical populations and have implications for etiology and treatments.
Show less
Date Issued
2013
Identifier
CFH0004377, ucf:44993
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFH0004377
A PSYCHOPHYSIOLOGICAL INVESTIGATION OF THE PROPOSED PARADOXICAL EFFECTS OF VALUING HAPPINESS
Title
A PSYCHOPHYSIOLOGICAL INVESTIGATION OF THE PROPOSED PARADOXICAL EFFECTS OF VALUING HAPPINESS.
Creator
Coles, Nicholas, Sims, Valerie, University of Central Florida
Abstract / Description
Several researchers in happiness studies have called for an increased sociopolitical interest in indicators of societal happiness. However, recent evidence for the proposed paradoxical effects of valuing happiness suggest that an increase in society's perceived value of happiness may exert a detrimental, inverse influence on well-being. This notion is based on previous research demonstrating that manipulating participants to value happiness causes them to experience less positive emotions,...
Show moreSeveral researchers in happiness studies have called for an increased sociopolitical interest in indicators of societal happiness. However, recent evidence for the proposed paradoxical effects of valuing happiness suggest that an increase in society's perceived value of happiness may exert a detrimental, inverse influence on well-being. This notion is based on previous research demonstrating that manipulating participants to value happiness causes them to experience less positive emotions, compared to controls, when viewing positive film clips. Following the humanistic notion that the maximization of societal happiness is an advantageous sociopolitical endeavor, the proposed paradoxical effects of valuing happiness present a psychological barrier that researchers must strive to understand and, ideally, overcome. Previous experimental research on the paradoxical effects of valuing happiness has focused on participants' emotionality as an operational definition of happiness. However, drawing from the Subjective Well-Being construct, emotionality is only one of several components of happiness. Building from this Subjective-Well Being framework, this study expands upon previous research by investigating whether a valuing happiness manipulation influences participants' emotionality while they contemplate their own happiness. To examine this, nineteen participants were divided into two groups, one which received a valuing happiness manipulation (n=9) and the others served as a control group (n=10), and instructed to contemplate their personal happiness for 45 seconds. To measure participants' emotions during this task, facial electromyography data were collected from the corrugator supercilii and the zygomaticus major facial muscles, a measure that previous research suggests is sensitive to the emotional value of thought. Results indicated that participants manipulated to value happiness did not experience significant differences in facial electromyography activation compared to controls. However, although non-significant, the correlation between facial electromyography activation and participants' rating of happiness differed substantially for participants manipulated to value happiness (average r=.41 for corrugator, average r=-.09 for zygomaticus) and controls (average r=.-.29 for corrugator, average r=.14 for zygomaticus). The counterintuitive correlations for participants led to value happiness, despite not experiencing significant difference in the emotional value of the happiness contemplation task, provide preliminary evidence that these participants utilize the information retrieved from the contemplative stage in a qualitatively different way than controls when judging their own happiness. More specifically, the correlations for participants led to value happiness trend in the opposite direction of controls, demonstrating that increases in positive emotion during happiness contemplation actually are associated with lower scores on a self-report of happiness. This study suggests that the paradoxical effects of valuing happiness does not influence the retrieval of information when contemplating ones' happiness, but may influence (in an apparently detrimental fashion) how this information is utilized when judging one's happiness. Although the between-condition differences in correlations failed to reach statistical significance (more specifically, p=.09 for corrugator), this study provides preliminary evidence for the existence of a new dynamic of the proposed paradoxical effects of valuing happiness that is novel to the happiness studies discourse. Limitations, implications, and future directions are discussed.
Show less
Date Issued
2015
Identifier
CFH0004766, ucf:45360
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFH0004766