Discovering networks altered by potential threat ("anxiety") using quadratic discriminant analysis.

Discovering networks altered by potential threat ("anxiety") using quadratic discriminant analysis.
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DOI:
10.1016/j.neuroimage.2015.05.002
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发表时间:
2015-08-01
期刊:
影响因子:
5.7
通讯作者:
Pessoa L
Pessoa L
中科院分区:
医学1区
文献类型:
--
作者:
McMenamin BW;Pessoa L

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研究人员最近才开始使用功能神经成像来探索人类对持续焦虑预期时期的反应,即潜在威胁。在这里,我们研究了在指示的休克威胁范式中使用功能磁共振获得的大脑反应,该范式用于创造持续的厌恶预期时期。在对之前发表的数据的重新分析中,我们使用了二次判别分析来对全脑功能连接的多变量模式进行分类,并确定在潜在威胁期间连接的变化。我们的方法在体素的基础上识别连通性改变的集群,从而避免了预先定义区域的需要。通过对培训期间未使用的参与者的数据进行测试,对分类器泛化进行评估。在威胁和安全环境之间进行可靠的分类是可能的,对“诊断特征”的检查显示,涉及顶叶内沟、任务阴性区域、纹状体和前扣带皮质的功能连接发生了变化。我们预计,所提出的方法将被证明对希望识别区分实验条件或组的大规模功能网络的实验者有用。
Researchers have only recently begun using functional neuroimaging to explore the human response to periods of sustained anxious anticipation, namely potential threat. Here, we investigated brain responses acquired with functional MRI during an instructed threat of shock paradigm used to create sustained periods of aversive anticipation. In this re-analysis of previously published data, we employed Quadratic Discriminant Analysis to classify the multivariate pattern of whole-brain functional connectivity and to identify connectivity changes during periods of potential threat. Our method identifies clusters with altered connectivity on a voxelwise basis, thus eschewing the need to define regions a priori. Classifier generalization was evaluated by testing on data from participants not used during training. Robust classification between threat and safe contexts was possible, and inspection of “diagnostic features” revealed altered functional connectivity involving the intraparietal sulcus, task-negative regions, striatum, and anterior cingulate cortex. We anticipate that the proposed method will prove useful to experimenters wishing to identify large-scale functional networks that distinguish between experimental conditions or groups.
在大鼠和人类中持续的恐惧:恐惧与焦虑中的杏仁核的作用。
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