The effects of sleep deprivation on emotional reactivity: the influence of context effects
| Autor: | Hsin-Yi Chiang, 蔣馨怡 |
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| Rok vydání: | 2016 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 104 Objective: Sleep deprivation (SD) affects various cognitive performances negatively, but sleep loss has been found to have mixed results on the subjective evaluation of emotional stimuli. Our evaluation of event is influenced profoundly by the context which we encounter. It is generally assumed that any potentially confounding contextual effects are controlled by using a random presentation sequence. However, study shows that context effects might be revealed in random presentation sequence. In order to evaluate the effects of SD on the context effects and subjective evaluation of emotional stimuli, the present study also examined whether the subjective evaluation of a target stimuli is influenced by a preceding emotional stimuli. Methods: The stimuli were 144 pictures selected from the International Affective Picture System (IAPS). To create an emotional context, a negative, indifferent or positive picture was preceded by three types of pictures, i.e., negative, indifferent and positive pictures, resulting in nine pairings. Thirty-seven participants were random assigned to the normal sleep (NS) (n = 18) or sleep deprivation (SD) group, and rated their valence and arousal responses to negative, indifferent and positive target pictures during the day following normal sleep (7-9 hrs / day) or one night total sleep deprivation. Participants were asked to judge their emotional reactions while viewing pictures by means of the Self-Assessment Manikin (SAM). Results and Conclusions: The results indicated that SD participants perceived the negative and indifferent pictures more unpleasant, and positive picture more pleasant compared to NS participants. On the other hand, participants in both groups perceived negative target pictures more unpleasant after seeing a negative context (i.e., assimilation effect) and positive context (i.e., contrast effect) relative to indifferent context. Finally, participants in both groups perceived positive target pictures less pleasant and arousing after seeing a positive context (i.e., contrast effect) compared with indifferent context. These findings suggest that sleep deprivation impacts reactivity to emotional stimuli through automated attentional and self-regulatory processes, and contextual modulation affects subjective evaluation of emotional stimuli depends on the allocation of cognitive resources and overlap between the target’ range and the context’s range on the interpretation judgmental dimension. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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