Journal
HUMAN BRAIN MAPPING
Volume 30, Issue 2, Pages 532-540Publisher
WILEY
DOI: 10.1002/hbm.20521
Keywords
affective arousal; electroencephalography; emotion; Granger causality; steady-state potentials
Funding
- Deutsche Forschungsgemeinschaft
- National Institute of Mental Health (NIMH)
- Center for the Study of Emotion and Attention (CSEA)
- University of Florida [P50-MH52384]
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Re-entrant modulation of visual cortex has been suggested as a critical process for enhancing perception of emotionally arousing visual stimuli. This study explores how the time information inherent in large-scale electrocortical measures can be used to examine the functional relationships among the structures involved in emotional perception. Granger causality analysis was conducted on steady-state visual evoked potentials elicited by emotionally arousing pictures flickering at a rate of 10 Hz. This procedure allows one to examine the direction of neural connections. Participants viewed pictures that varied in emotional content, depicting people in neutral contexts, erotica, or interpersonal attack scenes. Results demonstrated increased Coupling between visual and cortical areas when viewing emotionally arousing content. Specifically, intraparietal to inferotemporal and precuneus to calcarine connections were stronger for emotionally arousing picture content. Thus, we provide evidence for re-entrant signal flow during emotional perception, which originates from higher tiers and enters lower tiers of visual cortex. Hum Brain Mapp 30:532-540, 2009. (C) 2007 Wiley-Liss, Inc.
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