Experience-dependent modulation of category-related cortical activity
Experience-dependent modulation of category-related cortical activity
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DOI：
10.1093/cercor/12.5.545
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发表时间：
2002-05-01
期刊：
影响因子：
3.7
通讯作者：
Martin, A
中科院分区：
文献类型：
--
作者：
Chao, LL;Weisberg, J;Martin, A
不同类别的物体（例如动物或工具）的照片在不同的大脑区域引起最大的反应。然而，这些“特定类别”区域通常也会对其他对象类别做出反应。在这里，我们使用刺激熟悉性，以进一步研究类别表征。动物和工具的照片在一些先前确定的区域引起了与类别相关的活动。这种活动减少熟悉相对于新的刺激。减少激活发生在腹侧枕颞叶皮层的所有对象响应区，无论最初产生的最大反应类别。这表明腹侧枕颞皮质中的物体表征并不局限于离散的区域，而是广泛且重叠的。在其他区域（如外侧颞叶和左侧运动前皮质），经验依赖性减少是类别特异性的。总之，这些研究结果表明，类别相关的激活反映了检索有关类别特定的功能和属性的信息。
Naming pictures of objects from different categories (e.g. animals or tools) evokes maximal responses in different brain regions. However, these 'category-specific' regions typically respond to other object categories as well. Here we used stimulus familiarity to further investigate category representation. Naming pictures of animals and tools elicited category-related activity in a number of previously identified regions. This activity was reduced for familiar relative to novel stimuli. Reduced activation occurred in all object-responsive areas in the ventral occipito-temporal cortex, regardless of which category initially produced the maximal response. This suggests that object representations in the ventral occipito-temporal cortex are not limited to a discrete area, but rather are widespread and overlapping. In other regions (e.g. the lateral temporal and left premotor cortices), experience-dependent reductions were category specific. Together, these findings suggest that category-related activations reflect the retrieval of information about category-specific features and attributes.