Task influences pattern discriminability for faces and bodies in ventral occipitotemporal cortex.
Task influences pattern discriminability for faces and bodies in ventral occipitotemporal cortex.
复制标题
任务会影响腹侧枕皮层中面部和身体的模式可区分性。
DOI：
10.1080/17470919.2015.1131194
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发表时间：
2016-12
影响因子：
2
通讯作者：
McCarthy G
中科院分区：
文献类型：
--
作者：
Kim NY;McCarthy G
我们先前的研究表明，面孔和身体激活了腹侧枕颞叶皮质(VOTC)的重叠区域。然而，当使用多体素模式分析对人脸和身体的活动空间模式进行分类时，在这些相同的重叠区域中仍然可以区分人脸和身体。我们考察了这些空间模式及其时间进程是否受到不同分类任务的影响。参与者观看了描绘快乐或恐惧情绪的面孔或无头身体的图片。在一项任务中，他们把照片归类为一张脸或一张身体，而不考虑情绪。在另一项任务中，他们对情绪进行了分类，无论它是由面部还是身体描述的。使用独立数据训练的分类器，我们发现对于情感分类任务，人脸-身体分类的准确率更高。分类器被应用于刺激后的每个时间点，以表征分类的时间过程。起初，在两项任务中，准确率都高于机会，但当参与者对情绪进行分类时，准确率会在更长的持续时间内增加。因此，VOTC中面孔和身体模式差异的时间进程受到观察者行为目标的调节，提示任务情境对VOTC中的类别选择活动具有自上而下的调制效应。
Our prior research showed that faces and bodies activate overlapping regions of the ventral occipitotemporal cortex (VOTC). However, faces and bodies were nonetheless discriminable in these same overlapping regions when their spatial patterns of activity were classified using multi-voxel pattern analysis. Here we investigated whether these spatial patterns and their time courses were influenced by different categorization tasks. Participants viewed pictures of faces or headless bodies depicting a happy or fearful emotion. In one task, they categorized the picture as a face or a body regardless of emotion. In the other task, they categorized the emotion regardless of whether it was depicted by a face or body. Using a classifier trained on independent data, we found higher face-body classification accuracy for the emotion categorization task. The classifier was applied to each post-stimulus time-point to characterize the temporal course of classification. Accuracy initially rose equivalently above chance for both tasks, but then increased over a longer duration when participants categorized emotions. Thus, the temporal course of pattern differences between faces and bodies in VOTC were modulated by the behavioral goal of the observer, suggesting the top-down modulatory effect of task context on the category-selectivity activity in the VOTC.
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影响因子：
2.9
作者：
Harry B;Williams MA;Davis C;Kim J
通讯作者：
Kim J
影响因子：
3.8
作者：
de Gelder B;Van den Stock J
通讯作者：
Van den Stock J
影响因子：
5.3
作者：
Downing, Paul E.;Wiggett, Alison J.;Peelen, Marius V.
通讯作者：
Peelen, Marius V.
DOI：
10.1073/pnas.1312567111
发表时间：
2014-03-11
影响因子：
11.1
作者：
Harel, Assaf;Kravitz, Dwight J.;Baker, Chris I.
通讯作者：
Baker, Chris I.
影响因子：
25
作者：
Cukur, Tolga;Nishimoto, Shinji;Huth, Alexander G.;Gallant, Jack L.
通讯作者：
Gallant, Jack L.