Subordinate Categorization Enhances the Neural Selectivity in Human Object-selective Cortex for Fine Shape Differences
Subordinate Categorization Enhances the Neural Selectivity in Human Object-selective Cortex for Fine Shape Differences
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DOI：
10.1162/jocn.2009.21089
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发表时间：
2009-06-01
影响因子：
3.2
通讯作者：
Wagemans, Johan
中科院分区：
文献类型：
--
作者：
Gillebert, Celine R.;Op de Beeck, Hans P.;Wagemans, Johan
有大量的证据表明，成人的物体表征是通过学习动态更新的。然而，目前还不清楚在何种程度上，这些影响是由视觉对象在一个特定的任务背景下的积极处理的影响，仅仅暴露于相同的对象。在这里，我们证明了这项任务确实很重要。我们进行了一个事件相关的功能磁共振成像适应性研究中，我们来自神经的选择性释放的适应。我们有两个训练条件：“分类对象”根据精细形状差异（这是哪种鱼？）而“控制对象”在不需要从属分类的任务上下文中同样常见（这是花瓶还是花瓶？）。训练后，对象选择皮层对分类对象之间的差异比对控制对象之间的差异更具选择性。这一结果表明，在训练过程中的任务上下文调制的程度，对象的选择性增强作为一个结果的培训。
There is substantial evidence that object representations in adults are dynamically updated by learning. However, it is not clear to what extent these effects are induced by active processing of visual objects in a particular task context on top of the effects of mere exposure to the same objects. Here we show that the task does matter. We performed an event-related fMRI adaptation study in which we derived neural selectivity from a release of adaptation. We had two training conditions: "categorized objects'' were categorized at a subordinate level based on fine shape differences (Which type of fish is this?), whereas "control objects'' were seen equally often in a task context requiring no subordinate categorization (Is this a vase or not?). After training, the object-selective cortex was more selective for differences among categorized objects than for differences among control objects. This result indicates that the task context during training modulates the extent to which object selectivity is enhanced as a result of training.