The Neural Basis of Categorical Face Perception: Graded Representations of Face Gender in Fusiform and Orbitofrontal Cortices
The Neural Basis of Categorical Face Perception: Graded Representations of Face Gender in Fusiform and Orbitofrontal Cortices
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DOI：
10.1093/cercor/bhp195
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发表时间：
2010-06-01
期刊：
影响因子：
3.7
通讯作者：
Ambady, Nalini
中科院分区：
文献类型：
--
作者：
Freeman, Jonathan B.;Rule, Nicholas O.;Ambady, Nalini
面孔性别，像许多其他事物一样，被绝对地感知：主观感知被扭曲到男性或女性的类别，并且在面孔之间固有的客观梯度部分丢失。这种分类面孔感知的神经基础实际上仍然是未知的。参与者被动地观看面部的性二态性内容从男性到女性单调地变形，而神经活动使用功能性磁共振成像测量。主观知觉显示出强烈的非线性，尽管单调的线性变化，面对性别，与分类知觉一致。神经影像学结果表明，外侧梭状回，双侧，梭状脸面积线性编码客观面孔性别的分级参数，但这些地区的相关性大大低于主观知觉（这是非线性的，受分类知觉效应）。然而，这种主观感知在眶额皮层中表现出来，但这一区域与客观参数的相关性要小得多。梭形和眶额皮质中的面部性别的注意力独立的分级表征揭示了客观面部参数是如何编码并转化为人类大脑中的主观分类扭曲感知的。
Face gender, like many other things, is perceived categorically: Subjective perceptions are distorted toward the categories, male or female, and the objective gradiency inherent across faces is partially lost. The neural basis of such categorical face perception remains virtually unknown. Participants passively viewed faces whose sexually dimorphic content was morphed monotonically from male to female while neural activity was measured using functional magnetic resonance imaging. Subjective perceptions revealed strong nonlinearity despite monotonic linear changes in face gender, consistent with categorical perception. Neuroimaging results indicated that the lateral fusiform gyrus, bilaterally, and the fusiform face area linearly encoded graded parameters of objective face gender, but these regions correlated substantially less with subjective perceptions (which were nonlinear and affected by categorical perception effects). Such subjective perceptions, however, were represented in the orbitofrontal cortex, but this region correlated substantially less with objective parameters. The attention-independent graded representations of face gender in fusiform and orbitofrontal cortices reveal how objective face parameters are encoded and transformed into subjective categorically warped perceptions in the human brain.