Face inversion disrupts the perception of vertical relations between features in the right human occipito-temporal cortex
Face inversion disrupts the perception of vertical relations between features in the right human occipito-temporal cortex
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DOI：
10.1348/174866408x292670
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发表时间：
2009-03-01
影响因子：
2.2
通讯作者：
Goebel, Rainer
中科院分区：
文献类型：
--
作者：
Goffaux, Valerie;Rossion, Bruno;Goebel, Rainer
在两个fMRI实验中，研究了反演对提取相关信息和特征信息的影响。与之前的研究不同，水平和垂直空间关系的贡献被分开考虑，因为它们已被证明对人脸反转的脆弱性不同（Goffaux & Rossion, 2007）。因此，倒置在很大程度上影响了对垂直关系（如眼睛或嘴巴高度）的感知，而对特征（如眼睛形状和表面）和水平关系（如眼间距离）的处理受到的影响要小得多。参与者观看的一对对面孔要么在一个局部特征（即眼睛）的水平上不同，要么在这个特征与相邻特征的空间关系上不同。空间关系的变化分为两种情况，取决于垂直或水平轴的修改。这些刺激条件在第一个（block）实验中以单独的块呈现，而在第二个事件相关（ER）实验中以随机顺序呈现。Face-preferring压位于right-lateralized中间梭状回和反演(rMFG)在很大程度上减少他们的活动。在左偏侧的中梭状回（IMFG）中，反转相关的下降更为温和。内质网实验显示，在不同的刺激条件下，倒转会影响rMFG和IMFG的活性。反演仅在特征条件下影响IMFG的处理，而在rMFG中选择性地影响垂直关系的处理。相关分析进一步表明，在rMFG和右侧枕下回（HOG）中观察到的反转效应（IE）可靠地预测了在处理垂直关系时观察到的大行为IE。相反，在处理水平关系时，IMFG IE与观察到的弱行为IE相关。我们的研究结果表明，人脸配置主要是在rMFG中编码的，而更多的局部方面的人脸信息，如特征和水平空间关系，驱动着IMFG的处理。这些发现证实了这样一种观点，即面孔感知的易感性主要来自于面孔偏好区域右侧网络中垂直面孔关系的加工中断（rMFG, rIOG）。
The impact of inversion on the extraction of relational and featural face information was investigated in two fMRI experiments. Unlike previous studies, the contribution of horizontal and vertical spatial relations were considered separately since they have been shown to be differentially vulnerable to face inversion (Goffaux & Rossion, 2007). Hence, inversion largely affects the perception of vertical relations (e.g. eye or mouth height) while the processing of features (e.g. eye shape and surface) and of horizontal relations (e.g. inter-ocular distance) is affected to a far lesser extent. Participants viewed pairs of faces that differed either at the level of one local feature (i.e. the eyes) or of the spatial relations of this feature with adjacent features. Changes of spatial relations were divided into two conditions, depending on the vertical or horizontal axis of the modifications. These stimulus conditions were presented in separate blocks in the first (block) experiment while they were presented in a random order in the second event-related (ER) experiment. Face-preferring voxels located in the right-lateralized middle fusiform gyrus (rMFG) largely decreased their activity with inversion. Inversion-related decreases were more moderate in left-lateralized middle fusiform gyrus (IMFG). ER experiment revealed that inversion affected rMFG and IMFG activity in distinct stimulus conditions. Whereas inversion affected IMFG processing only in featural condition, inversion selectively affected the processing of vertical relations in rMFG. Correlation analyses further indicated that the inversion effect (IE) observed in rMFG and right inferior occipital gyrus (HOG) reliably predicted the large behavioural IE observed for the processing of vertical relations. In contrast, IMFG IE correlated with the weak behavioural IE observed for the processing of horizontal relations. Our findings suggest that face configuration is mostly encoded in rMFG, whereas more local aspects of face information, such as features and horizontal spatial relations drive IMFG processing. These findings corroborate the view that the vulnerability of face perception to inversion stems mainly from the disrupted processing of vertical face relations in the right-lateralized network of face-preferring regions (rMFG, rIOG).