Recognizing an individual face: 3D shape contributes earlier than 2D surface reflectance information
Recognizing an individual face: 3D shape contributes earlier than 2D surface reflectance information
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DOI：
10.1016/j.neuroimage.2009.05.065
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发表时间：
2009-10-01
期刊：
影响因子：
5.7
通讯作者：
Rossion, Bruno
中科院分区：
文献类型：
--
作者：
Caharel, Stephanie;Jiang, Fang;Rossion, Bruno
人脑通过两种主要的诊断信息源来识别人脸：三维（3D）形状和二维（2D）表面反射率。本研究采用事件相关电位（ERP）的面孔适应范式考察了这两类信息加工的时程。使用3D变形模型，我们生成了一对相同的脸，这些脸要么只在3D形状上不同，要么只在2D表面反射率上不同，或者两者都不同。16名人类观察员在这4种类型的对，其中第一个（适应）面对紧随其后的第二个（测试）面对个人的面孔。行为上，观察者是准确和快速区分个人的面孔，无论是3D形状或2D表面反射率单独，但更快，当两个信息源都存在。早在面部敏感的N170分量（类似于测试面部之后的160 ms），相对于相同面部的重复，3D形状的变化幅度更大，尤其是在右侧枕颞电极上。然而，适配器和靶面之间的2D反射率的变化不会增加N170振幅。在约250 ms时，3D形状和2D反射率的贡献相等，并且当3D形状和2D反射率结合时，发现与相同面部的重复相比振幅的最大差异，这与观察者的行为一致。这些观察结果表明，从诊断3D形状信息比从2D表面反射信息识别个体面孔的证据在右半球人类视觉皮层中积累得更快。(C)2009 Elsevier Inc. All rights reserved.
The human brain recognizes faces by means of two main diagnostic sources of information: three-dimensional (3D) shape and two-dimensional (2D) Surface reflectance. Here we used event-related potentials (ERPs) ill a face adaptation paradigm to examine the time-course of processing for these two types of information. With a 3D morphable model, we generated pairs of faces that were either identical, varied in 3D shape only, in 2D surface reflectance only, or in both. Sixteen human observers discriminated individual faces in these 4 types of pairs, in which a first (adapting) face was followed shortly by a second (test) face. Behaviorally, observers were as accurate and as fast for discriminating individual faces based oil either 3D shape or 2D surface reflectance alone, but were faster when both sources of information were present. As early as the face-sensitive N170 component (similar to 160 ms following the test face), there was larger amplitude for changes in 3D shape relative to the repetition of the same face, especially over the right occipito-temporal electrodes. However, changes in 2D reflectance between the adapter and target face did not increase the N170 amplitude. At about 250 ms, both 3D shape and 2D reflectance contributed equally, and the largest difference in amplitude compared to the repetition of the same face was found when both 3D shape and 2D reflectance were combined, in line with observers' behavior. These observations indicate that evidence to recognize individual faces accumulate faster in the right hemisphere human Visual cortex from diagnostic 3D shape information than from 2D surface reflectance information. (C) 2009 Elsevier Inc. All rights reserved.