Ventromedial Prefrontal Cortex is Critical for the Regulation of Amygdala Activity in Humans

Overview

Journal Biol Psychiatry

Publisher Elsevier

Specialty Psychiatry

Date 2014 Mar 29

PMID 24673881

Citations 189

Authors

Julian C Motzkin

Carissa L Philippi

Richard C Wolf

Mustafa K Baskaya

Michael Koenigs

Affiliations

Soon will be listed here.

Abstract

Background: Dysfunction in the ventromedial prefrontal cortex (vmPFC) is believed to play a pivotal role in the pathogenesis of mood and anxiety disorders. Leading neurocircuitry models of these disorders propose that hypoactivity in the vmPFC engenders disinhibited activity of the amygdala and, consequently, pathologically elevated levels of negative affect. This model predicts that a selective loss or diminution of function of the vmPFC would result in heightened activity of the amygdala. Although this prediction has been borne out in rodent lesion and electrophysiologic studies using fear conditioning and extinction paradigms, there has not yet been a definitive test of this prediction in humans.

Methods: We tested this prediction through a novel use of functional magnetic resonance imaging in four neurosurgical patients with focal, bilateral vmPFC damage.

Results: Relative to neurologically healthy comparison subjects, the patients with vmPFC lesions exhibited potentiated amygdala responses to aversive images and elevated resting-state amygdala functional connectivity. No comparable group differences were observed for activity in other brain regions.

Conclusions: These results provide unique evidence for the critical role of the vmPFC in regulating activity of the amygdala in humans and help elucidate the causal neural interactions that underlie mental illness.

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