Amygdala response and functional connectivity during emotion regulation: A study of 14 depressed adolescents

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• 作者：Greg Perlman^a ; ^e ; Alan N. Simmons^a ; ^c ; Jing Wu^d ; ^f ; Kevin S. Hahn^d ; Susan F. Tapert^c ; ^a ; Jeffrey E. Max^a ; ^b ; Martin P. Paulus^a ; ^c ; Gregory G. Brown^a ; ^c ; Guido K. Frank^g ; Laura Campbell-Sills^a ; Tony T. Yang^a ; ^b ; ^{tyang@ucsd.edu}
• 关键词：Major depression ; Functional MRI ; Insula ; Reappraisal ; Prefrontal cortex
• 刊名：Journal of Affective Disorders
• 出版年：2012
• 期刊代码：141_01650327
• 类别：med
• 出版时间：June, 2012
• 卷：139
• 期：1
• 页码：75-84
• 文件大小：972 K

摘要

Background

Ineffective emotion regulation and abnormal amygdala activation have each been found in adolescent-onset major depressive disorder. However, amygdala activation during emotion regulation has not been studied in adolescent-onset major depressive disorder.

Method

Fourteen unmedicated adolescents diagnosed with current depression without comorbid psychiatric disorders and fourteen well-matched controls ages 13 to 17 years underwent an emotional regulation task during functional magnetic resonance imaging. During this task, participants viewed negatively-valence images and were asked to notice how they were feeling without trying to change it and maintain their emotional reaction (鈥淢aintain鈥? or to interpret the image in such a way as minimize their emotional response (鈥淩educe鈥?.

Results

Imaging analyses demonstrated that adolescents with depression showed: (1) greater right amygdala activation during the maintain condition relative to controls, (2) less connectivity during the maintain condition between the amygdala and both the insula and medial prefrontal cortex than controls, and (3) a significant positive correlation between amygdala-seeded connectivities during maintenance of emotion and psychosocial functioning.

Limitations

The current study is a cross-sectional comparison and longitudinal investigations with larger sample sizes are needed to examine the association between amygdala reactivity and emotion regulation over time in adolescent MDD.

Conclusions

During the maintain condition, adolescents with depression showed a heightened amygdala response and less reciprocal activation in brain regions that may modulate the amygdala. A poorly modulated, overreactive amygdala may contribute to poor emotion regulation.