Prefrontal-occipitoparietal coupling underlies late latency human neuronal responses to emotion



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Moratti, Stephan and Saugar, Cristina and Strange, Bryan A (2011) Prefrontal-occipitoparietal coupling underlies late latency human neuronal responses to emotion. The Journal of neuroscience : the official journal of the Society for Neuroscience, 31 (47). pp. 17278-86. ISSN 1529-2401

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Enhanced late positive potentials (LPPs) evoked by highly arousing unpleasant and pleasant stimuli have been consistently observed in event-related potential experiments in humans. Although the psychological factors modulating the LPP have been studied in detail, the neurobiological underpinnings of this response remain poorly understood. Current models suggest that the LPP is a product of both an automatic facilitation of perceptual activity, as well as postperceptual processing under cognitive control. Here we applied magnetoencephalography (MEG) and beamformer analysis combined with Granger causality measures to provide a mechanistic account for LPP generation that reconciles these two models. We demonstrate that the magnetic homolog of the LPP, mLPP, is localized within bilateral occipitoparietal and right prefrontal cortex. Critically, directed functional connectivity analysis between these brain regions, indexed by Granger causality, demonstrates stronger bidirectional influences between frontal and occipitoparietal cortex for high arousing emotional relative to low arousing neutral pictures. Thus, both bottom-up and top-down accounts of the late latency response to emotion derived from psychological studies can be explained by a reciprocal codependency between activity in prefrontal and occipitoparietal cortex.

Item Type:Article
Uncontrolled Keywords:Perception; Late positive potentials; Emotional stimuli; Neurological responses
Subjects:Medical sciences > Psychology > Perception
ID Code:37035
Deposited On:18 Jul 2017 11:47
Last Modified:18 Jul 2017 11:47

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