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Personality Traits Modulate the Impact of Emotional Stimuli During a Working Memory Task : A Near-Infrared Spectroscopy Study

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Title: Personality Traits Modulate the Impact of Emotional Stimuli During a Working Memory Task : A Near-Infrared Spectroscopy Study
Authors: Sugi, Masaaki Browse this author
Sakuraba, Satoshi Browse this author
Saito, Hirotada Browse this author
Miyazaki, Mitsunori Browse this author →KAKEN DB
Yoshida, Susumu Browse this author →KAKEN DB
Kamada, Tatsuhiro Browse this author
Sakai, Shinya Browse this author →KAKEN DB
Sawamura, Daisuke Browse this author →KAKEN DB
Keywords: personality trait
emotional stimuli
dorsolateral prefrontal cortex
near-infrared spectroscopy
dualn-back task
Issue Date: 17-Sep-2020
Publisher: Frontiers Media
Journal Title: Frontiers in behavioral neuroscience
Volume: 14
Start Page: 514414
Publisher DOI: 10.3389/fnbeh.2020.514414
PMID: 33093826
Abstract: The purpose of the present study was to examine the influence of personality traits on the impact of emotional stimuli focusing onn-back task performance and brain activity changes. Previous neuroimaging studies have reported that individual differences in emotional processing can be attributed to personality traits, which is linked to the hemisphere-specific activity of the dorsolateral prefrontal cortex (DLPFC) in response to emotional stimuli. Thirty right-handed healthy young male participants were recruited in this study and classified into two groups, the behavioral inhibition system (BIS) group and behavioral activation system (BAS) group, based on their scores on the BIS/BAS scale. Participants saw six emotional images (two each with negative, neutral, and positive valence), which were selected from the International Affective Picture System and validated in a preliminary experiment. Then, a dual 2-back task that simultaneously employed auditory-verbal and visuospatial stimuli was conducted. Additionally, the concentration of oxygenated hemoglobin (Oxy-Hb) changes in the DLPFC was measured during the image presentation and dual 2-back task by near-infrared spectroscopy (NIRS). The task performance showed a significantly increased reaction time (RT) in the negative valence independent of personality traits. The results of Oxy-Hb changes showed a significant interaction between personality traits and emotional valence. Further, the hemisphere-subgroup analysis revealed that the right DLPFC activity was significantly higher in the negative valence than in the neutral valence in the BIS group; the right DLPFC activity was also significantly higher in the BIS group than in the BAS group in the positive valence. There was no main effect or interaction in the left DLPFC activity. These findings suggest the importance of considering personality traits when examining the impact of emotional stimuli. Further studies with large sample sizes warranted to examine the influence emotional stimuli exert on working memory performance, considering the personality traits to better understand individual differences in emotional processing.
Type: article
Appears in Collections:保健科学院・保健科学研究院 (Graduate School of Health Sciences / Faculty of Health Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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