Beyond shape: how you learn about objects affects how they are represented in visual cortex.
Beyond shape: how you learn about objects affects how they are represented in visual cortex.
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DOI：
10.1371/journal.pone.0008405
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发表时间：
2009-12-22
期刊：
影响因子：
3.7
通讯作者：
Gauthier I
中科院分区：
文献类型：
--
作者：
Wong AC;Palmeri TJ;Rogers BP;Gore JC;Gauthier I
经验可以改变物体在视觉皮层中的表现方式。但经验可以有不同的形式。目前还不清楚这种视觉体验是否系统地改变了视觉皮层物体表征的性质。我们利用不同的训练方案，发现产生定性不同类型的知觉专业知识的行为，以对比神经的变化，遵循不同种类的视觉经验与相同的对象。两组参与者经历了训练方案，要求要么从属级别的个性化或基本级别的分类的一套新颖的，人造的物体，称为“Ziggerins”。个性化训练后，右侧梭状回某个区域的fMRI活动增加，并且与行为上观察到的Ziggerins的形态处理幅度相关。与此相反，分类训练引起了分布的变化，增加了活动的腹侧枕颞皮层的内侧部分相对于更外侧的地区。我们的研究结果表明，对一类物体的体验可以系统地影响这些物体在视觉皮层中的表现方式。因此，先前学习经验的要求似乎是决定视皮层活动模式组织的一个因素。
Experience can alter how objects are represented in the visual cortex. But experience can take different forms. It is unknown whether the kind of visual experience systematically alters the nature of visual cortical object representations. We take advantage of different training regimens found to produce qualitatively different types of perceptual expertise behaviorally in order to contrast the neural changes that follow different kinds of visual experience with the same objects. Two groups of participants went through training regimens that required either subordinate-level individuation or basic-level categorization of a set of novel, artificial objects, called “Ziggerins”. fMRI activity of a region in the right fusiform gyrus increased after individuation training and was correlated with the magnitude of configural processing of the Ziggerins observed behaviorally. In contrast, categorization training caused distributed changes, with increased activity in the medial portion of the ventral occipito-temporal cortex relative to more lateral areas. Our results demonstrate that the kind of experience with a category of objects can systematically influence how those objects are represented in visual cortex. The demands of prior learning experience therefore appear to be one factor determining the organization of activity patterns in visual cortex.
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