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Small amygdala – high aggression? The role of the amygdala in modulating aggression in healthy subjects


Matthies, S; Rüsch, N; Weber, M; Lieb, K; Philipsen, A; Tuescher, O; Ebert, D; Hennig, J; van Elst, L T (2012). Small amygdala – high aggression? The role of the amygdala in modulating aggression in healthy subjects. World Journal of Biological Psychiatry, 13(1):75-81.

Abstract

OBJECTIVE:

Several lines of evidence suggest an association between the amygdala and the modulation of aggressive behaviour. Previous morphometric brain imaging studies have focused on the role of the amygdala in the context of pathologic neuropsychiatric conditions like depression, personality disorders, and dysphoric and aggressive behaviour in epilepsy. In order to better understand the physiological role of the amygdala in modulating aggressive behaviour we investigated the relationship between amygdala volumes and lifetime aggression in healthy subjects.
METHODS:

Morphometric brain scans were obtained in 20 healthy volunteers. Amygdala volumes were measured by manually outlining the boundaries of the structure following a well established and validated protocol. Careful psychiatric and psychometric assessment was done to exclude any psychiatric disorder and to assess lifetime aggressiveness with an established and validated psychometric instrument (i.e., Life History of Aggression Assessment (LHA)).
RESULTS:

All volunteers scored in the normal range of lifetime aggression. Volunteers with higher aggression scores displayed a 16-18% reduction of amygdala volumes. There was a highly significant negative correlation between amygdala volumes and trait aggression.
CONCLUSION:

The extent of volumetric differences in this study is remarkable and suggests that amygdala volumes might be a surrogate marker for the personality property of aggressiveness in healthy human beings.

Abstract

OBJECTIVE:

Several lines of evidence suggest an association between the amygdala and the modulation of aggressive behaviour. Previous morphometric brain imaging studies have focused on the role of the amygdala in the context of pathologic neuropsychiatric conditions like depression, personality disorders, and dysphoric and aggressive behaviour in epilepsy. In order to better understand the physiological role of the amygdala in modulating aggressive behaviour we investigated the relationship between amygdala volumes and lifetime aggression in healthy subjects.
METHODS:

Morphometric brain scans were obtained in 20 healthy volunteers. Amygdala volumes were measured by manually outlining the boundaries of the structure following a well established and validated protocol. Careful psychiatric and psychometric assessment was done to exclude any psychiatric disorder and to assess lifetime aggressiveness with an established and validated psychometric instrument (i.e., Life History of Aggression Assessment (LHA)).
RESULTS:

All volunteers scored in the normal range of lifetime aggression. Volunteers with higher aggression scores displayed a 16-18% reduction of amygdala volumes. There was a highly significant negative correlation between amygdala volumes and trait aggression.
CONCLUSION:

The extent of volumetric differences in this study is remarkable and suggests that amygdala volumes might be a surrogate marker for the personality property of aggressiveness in healthy human beings.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Psychiatric University Hospital Zurich > Clinic for Clinical and Social Psychiatry Zurich West (former)
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:2012
Deposited On:02 Apr 2012 09:30
Last Modified:05 Apr 2016 15:34
Publisher:Informa Healthcare
ISSN:1562-2975
Publisher DOI:https://doi.org/10.3109/15622975.2010.541282
PubMed ID:22256828

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