Journal of Biomedical Engineering Research (대한의용생체공학회:의공학회지)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
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Increased Gamma-band Neural Synchrony by Pleasant and Unpleasant Visual Stimuli

긍정, 부정 감정 유발 시각자극에 의한 감마-대역 신경동기화 증가

  • Yeo, Donghoon (Department of Biomedical Engineering, College of Health Science, Yonsei University) ;
  • Choi, Jeong Woo (Department of Biomedical Engineering, College of Health Science, Yonsei University) ;
  • Kim, Kyung Hwan (Department of Biomedical Engineering, College of Health Science, Yonsei University)
  • 여동훈 (연세대학교 보건과학대학 의공학과) ;
  • 최정우 (연세대학교 보건과학대학 의공학과) ;
  • 김경환 (연세대학교 보건과학대학 의공학과)
  • Received : 2018.02.22
  • Accepted : 2018.04.22
  • Published : 2018.04.30
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Abstract

It is known that gamma-band activity (GBA) and phase synchrony (GBPS) are induced by emotional visual stimuli. However, the characteristics of GBA and GBPS according to different emotional states have not been identified. The purpose of this study is to investigate the changes in gamma-band neuronal synchronization induced by positive and negative emotional visual stimuli using electroencephalograms (EEGs). Thirteen healthy male subjects have participated in the experiment. The induced spectral power in gamma-band was the highest for negative stimuli, and the lowest for neutral stimuli in 300-2,000 ms after the stimulus onset. The inter-regional phase synchronization in gamma-band was increased in 500-2,000 ms, mainly between the bilateral frontal regions and the parieto-occipital regions. Larger number of significant connections were found by negative stimuli compared to positive ones. Judging from temporal and spatial characteristics of the gamma-band activity and phase synchrony increases, the results may imply that affective visual stimuli cause stronger memory encoding than non-emotional stimuli, and this effect is more significant for negative emotional stimuli than positive ones.

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References

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