Kovács Gyula, Cziraki Csaba, Vidnyánszky Zoltán, Schweinberger Stefan R, Greenlee Mark W
Institute of Psychology, University of Regensburg, Regensburg, Germany.
Neuroimage. 2008 Oct 15;43(1):156-64. doi: 10.1016/j.neuroimage.2008.06.042. Epub 2008 Jul 11.
Adaptation to faces leads to face aftereffects and currently this topic attracts a lot of attention because it clearly shows that adaptation occurs even at the higher stages of visual cortical processing. Recently it has been found that long-term exposure to a face stimulus results in adaptation of a position-specific population of face sensitive neurons in addition to a position-invariant neural population, the later being also adapted in the case of short-term adaptation. Here we used the fMRI adaptation technique to investigate the neural locus of position-specific and position-invariant face adaptation. We show that in the right fusiform face area adaptation effects are position invariant and can be evoked by short (500 ms) as well as long (4500 ms) adaptation durations. On the other hand adaptation effects in the right occipital face area are position-specific and require long-term adaptation to develop. These findings imply that the behaviourally observed face aftereffects reflect time-dependent adaptation processes of both position-specific and invariant face sensitive neurons at different stages of visual processing.
对面孔的适应会导致面部后效应，目前这个话题吸引了很多关注，因为它清楚地表明即使在视觉皮层处理的较高阶段也会发生适应。最近发现，长期暴露于面部刺激除了会使位置不变的神经群体发生适应外，还会导致位置特异性的面部敏感神经元群体发生适应，而在短期适应的情况下，后者也会发生适应。在这里，我们使用功能磁共振成像适应技术来研究位置特异性和位置不变性面部适应的神经位点。我们表明，在右侧梭状面孔区，适应效应是位置不变的，并且可以由短（500毫秒）和长（4500毫秒）的适应持续时间诱发。另一方面，右侧枕叶面孔区的适应效应是位置特异性的，需要长期适应才能产生。这些发现意味着行为上观察到的面部后效应反映了视觉处理不同阶段位置特异性和不变性面部敏感神经元的时间依赖性适应过程。
