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KMID : 1137820180390030124
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의공학회지
2018 Volume.39 No. 3 p.124 ~ p.133
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Frontal Gamma-band Hypersynchronization in Response to Negative Emotion Elicited by Films
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Kim Hyun
Choi Jong-Doo
Choi Jeong-Woo
Yeo Dong-Hoon
Seo Pu-Kyeong
Her Seong-Jin
Kim Kyung-Hwan
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Abstract
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We tried to investigate the changes in cortical activities according to emotional valence states during watching video clips. We examined the neural basis of two emotional states (positive and negative) using spectral power analysis and brain functional connectivity analysis of cortical current density time-series reconstructed from high-density electroencephalograms (EEGs). Fifteen healthy participants viewed a series of thirty-two 2 min emotional video clips. Sixty-four channel EEGs were recorded. Distributed cortical sources were reconstructed using weighted minimum norm estimation. The temporal and spatial characteristics of spectral source powers showing significant differences between positive and negative emotion were examined. Also, correlations between gamma-band activities and affective valence ratings were determined. We observed the changes of cortical current density timeseries according to emotional states modulated by video clip. Gamma-band activities showed significant difference between emotional states for thirty seconds at the middle and the latter half of the video clip, mainly in prefrontal area. It was also significantly anti-correlated with the self-ratings of emotional valence. In addition, the gamma-band activities in frontal and temporal areas were strongly phase-synchronized, more strongly for negative emotional states. Cortical activities in frontal and temporal areas showed high spectral power and inter-regional phase synchronization in gamma-band during negative emotional states. It is inferred that the higher amygdala activation induced by negative stimuli resulted in strong emotional effects and caused strong local and global synchronization of neural activities in gamma-band in frontal and temporal areas.
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KEYWORD
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Emotion, Negativity-bias, Electroencephalograms (EEGs), Gamma-band activity (GBA), Gamma-band phase synchronization (GBPS)
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