J Korean Med Sci.
2019 May;34(20):e146. 10.3346/jkms.2019.34.e146.
Spatiotemporal Analysis of Event-related Current Density Reveals Dissociable Effects of Arousal and Valence on Emotional Picture Processing
- Affiliations
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- 1Department of Biomedical Engineering, College of Health Science, Yonsei University, Wonju, Korea. khkim0604@yonsei.ac.kr
- 2Department of Neurosurgery, David Geffen School of Medicine, University of California, Los Angeles, CA, USA.
- 3Department of Neurology, Seoul National University College of Medicine, Seoul, Korea.
- KMID: 2447037
- DOI: http://doi.org/10.3346/jkms.2019.34.e146
Abstract
- BACKGROUND
The processing of emotional visual stimulation involves the processing of emotional and visuoperceptual information. It is not completely revealed how the valence and arousal affect these two aspects. The objective was to investigate the effects of valence and arousal on spatiotemporal characteristics of cortical information processing using distributed source imaging of event-related current density (ERCD).
METHODS
Electroencephalograms (64 channels) were recorded from 19 healthy men while presenting affective pictures. Distributed source localization analysis was adopted to obtain the spatiotemporal pattern of ERCD on cortical surface in response to emotional visual stimulation. A nonparametric cluster-based permutation test was used to find meaningful time and space without prior knowledge.
RESULTS
Significant changes of ERCD in 400-800 ms among positive, negative, and neutral emotional conditions were found in left posterior cingulate cortex (PCC) and right inferior temporal cortex (ITC). In the PCC, the stimuli with higher arousal levels showed more negative ERCD than neutral stimuli. In the ITC, the ERCD for negative stimuli was significantly more negative than those of positive and neutral ones.
CONCLUSION
Arousal and valence had strong influence on memory encoding and visual analysis at late period. The location and time showing significant change in neural activity according to arousal and valence would provide valuable information for understanding the changes of cortical function by neuropsychiatric disorders.
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