Stability of amygdala BOLD response to fearful faces over multiple scan sessions

被引:126
作者
Johnstone, T
Somerville, LH
Alexander, AL
Oakes, TR
Davidson, RJ
Kalin, NH
Whalen, PJ
机构
[1] Univ Wisconsin, Waisman Ctr, Wm Keck Lab Funct Brain Imaging & Behav, Madison, WI 53705 USA
[2] Univ Wisconsin, Dept Psychiat, Madison, WI 53705 USA
[3] Univ Wisconsin, Dept Psychol, Madison, WI 53705 USA
关键词
stability; amygdala; BOLD response; fearful facial expression;
D O I
10.1016/j.neuroimage.2004.12.016
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
We used fMRI to examine amygdala activation in response to fearful facial expressions, measured over multiple scanning sessions. 15 human subjects underwent three scanning sessions, at 0, 2 and 8 weeks. During each session, functional brain images centered about the amygdala were acquired continuously while participants were shown alternating blocks of fearful, neutral and happy facial expressions. Intraclass correlation coefficients calculated across the sessions indicated stability of response in left amygdala to fearful faces (as a change from baseline), but considerably less left amygdala stability in responses to neutral expressions and for fear versus neutral contrasts. The results demonstrate that the measurement of fMRI BOLD responses in amygdala to fearful facial expressions might be usefully employed as an index of amygdala reactivity over extended periods. While signal change to fearful facial expressions appears robust, the experimental design employed here has yielded variable responsivity within baseline or comparison conditions. Future studies might manipulate the experimental design to either amplify or attenuate this variability, according to the goals of the research. © 2004 Elsevier Inc. All rights reserved.
引用
收藏
页码:1112 / 1123
页数:12
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