Benton Christopher P, Burgess Emma C
Department of Experimental Psychology, University of Bristol, Bristol, UK.
J Vis. 2008 Nov 10;8(15):1.1-6. doi: 10.1167/8.15.1.
Prolonged viewing of a face can result in a change of our perception of subsequent faces. This process of adaptation is believed to be functional and to reflect optimization-driven changes in the neural encoding. Because it is believed to target the neural systems underlying face processing, the measurement of face aftereffects is seen as a powerful behavioral technique that can provide deep insights into our facial encoding. Face identity aftereffects have typically been measured by assessing the way in which adaptation changes the perception of images from a test sequence, the latter commonly derived from morphing between two base images. The current study asks to what extent such face aftereffects are driven by the test sequence used to measure them. Using subjects trained to respond either to identity of expression, we examined the effects of identity and expression adaptation on test stimuli that varied in both identity and expression. We found that face adaptation produced measured aftereffects that were congruent with the adaptation stimulus; the composition of the test sequences did not affect the measured direction of the face aftereffects. Our results support the view that face adaptation studies can meaningfully tap into the intrinsically multidimensional nature of our representation of facial identity.
长时间观察一张脸会导致我们对后续面孔的感知发生变化。这种适应过程被认为具有功能性，并反映了神经编码中由优化驱动的变化。由于人们认为它针对的是面部处理背后的神经系统，因此对面部后效应的测量被视为一种强大的行为技术，能够为我们的面部编码提供深刻见解。面部身份后效应通常通过评估适应如何改变来自测试序列的图像感知来测量，测试序列通常由两张基础图像之间的变形生成。当前的研究探讨了此类面部后效应在多大程度上受到用于测量它们的测试序列的驱动。我们让受试者接受训练，使其对表情身份做出反应，在此基础上，我们研究了身份适应和表情适应对身份和表情均不同的测试刺激的影响。我们发现，面部适应产生的测量后效应与适应刺激一致；测试序列的组成并不影响面部后效应的测量方向。我们的结果支持这样一种观点，即面部适应研究能够有效地探究我们面部身份表征本质上的多维度特性。
