Early gamma-band activity as a function of threat processing in the extrastriate visual cortex

Frances A. Maratos, Carl Senior, Karin Mogg, Brendan P. Bradley, Georgina Rippon

Research output: Contribution to journalArticle

Abstract

Various neuroimaging investigations have revealed that perception of emotional pictures is associated with greater visual cortex activity than their neutral counterparts. It has further been proposed that threat-related information is rapidly processed, suggesting that the modulation of visual cortex activity should occur at an early stage. Additional studies have demonstrated that oscillatory activity in the gamma band range (40-100 Hz) is associated with threat processing. Magnetoencephalography (MEG) was used to investigate such activity during perception of task-irrelevant, threat-related versus neutral facial expressions. Our results demonstrated a bilateral reduction in gamma band activity for expressions of threat, specifically anger, compared with neutral faces in extrastriate visual cortex (BA 18) within 50-250 ms of stimulus onset. These results suggest that gamma activity in visual cortex may play a role in affective modulation of visual processing, in particular with the perception of threat cues.
Original languageEnglish
Pages (from-to)62-68
Number of pages7
JournalCognitive Neuroscience
Volume3
Issue number1
Early online date30 Aug 2011
DOIs
Publication statusPublished - Mar 2012

Bibliographical note

Copyright 2012 Psychology Press, an imprint
of the Taylor & Francis Group, an Informa
business. This is an open access article freely available at https://www.tandfonline.com/doi/abs/10.1080/17588928.2011.613989

Keywords

  • threat
  • MEG
  • attention
  • gamma
  • anger

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