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Psychopaths Show Enhanced Amygdala Activation during Fear Conditioning. | LitMetric

Psychopaths Show Enhanced Amygdala Activation during Fear Conditioning.

Front Psychol

Department of Psychology, University of Wisconsin-Milwaukee, MilwaukeeWI, USA; Department of Neurology, Medical College of Wisconsin, MilwaukeeWI, USA.

Published: March 2016

AI Article Synopsis

Article Abstract

Psychopathy is a personality disorder characterized by emotional deficits and a failure to inhibit impulsive behavior and is often subdivided into "primary" and "secondary" psychopathic subtypes. The maladaptive behavior related to primary psychopathy is thought to reflect constitutional "fearlessness," while the problematic behavior related to secondary psychopathy is motivated by other factors. The fearlessness observed in psychopathy has often been interpreted as reflecting a fundamental deficit in amygdala function, and previous studies have provided support for a low-fear model of psychopathy. However, many of these studies fail to use appropriate screening procedures, use liberal inclusion criteria, or have used unconventional approaches to assay amygdala function. We measured brain activity with BOLD imaging in primary and secondary psychopaths and non-psychopathic control subjects during Pavlovian fear conditioning. In contrast to the low-fear model, we observed normal fear expression in primary psychopaths. Psychopaths also displayed greater differential BOLD activity in the amygdala relative to matched controls. Inverse patterns of activity were observed in the anterior cingulate cortex (ACC) for primary versus secondary psychopaths. Primary psychopaths exhibited a pattern of activity in the dorsal and ventral ACC consistent with enhanced fear expression, while secondary psychopaths exhibited a pattern of activity in these regions consistent with fear inhibition. These results contradict the low-fear model of psychopathy and suggest that the low fear observed for psychopaths in previous studies may be specific to secondary psychopaths.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4785144PMC
http://dx.doi.org/10.3389/fpsyg.2016.00348DOI Listing

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