猕猴纹外视觉区域V4中的刺激特异性竞争性选择
Stimulus-specific competitive selection in macaque extrastriate visual area V4.
作者信息
Fallah Mazyar, Stoner Gene R, Reynolds John H
机构信息
Systems Neurobiology Laboratory and Vision Center Laboratory, The Salk Institute for Biological Studies, La Jolla, CA 92037, USA.
出版信息
Proc Natl Acad Sci U S A. 2007 Mar 6;104(10):4165-9. doi: 10.1073/pnas.0611722104. Epub 2007 Feb 28.
Macaque visual area V4 has been implicated in the selective processing of stimuli. Prior studies of selection in area V4 have used spatially separate stimuli, thus confounding selection of retinotopic location with selection of the stimulus at that location. We asked whether V4 neurons can selectively respond to one of two differently colored stimuli even when they are spatially superimposed. We find that delaying one of the two stimuli leads to selective processing of the delayed stimulus by area V4 neurons. This selective processing persists when the stimuli move together across the visual field, thereby successively activating different populations of neurons. We also find that this effect is not a spatially global form of feature-based selection. We conclude that selective processing in area V4 is neither exclusively spatial nor feature-based and may thus be surface- or object-based.
猕猴视觉区域V4与刺激的选择性处理有关。先前对V4区域选择的研究使用了空间上分离的刺激，因此将视网膜拓扑位置的选择与该位置刺激的选择混为一谈。我们研究了V4神经元是否能够在两种不同颜色的刺激在空间上叠加时，选择性地对其中一种做出反应。我们发现，延迟两种刺激中的一种会导致V4神经元对延迟刺激进行选择性处理。当刺激在视野中一起移动从而相继激活不同的神经元群体时，这种选择性处理仍然存在。我们还发现，这种效应不是基于特征的空间全局选择形式。我们得出结论，V4区域的选择性处理既不完全基于空间，也不完全基于特征，因此可能是基于表面或物体的。
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