Modularity and intersection of "what", "where" and "how" processing of visual stimuli: A new method of fMRI localization
Modularity and intersection of "what", "where" and "how" processing of visual stimuli: A new method of fMRI localization
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DOI：
10.1007/s10548-005-0276-8
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发表时间：
2005-12-01
期刊：
影响因子：
2.7
通讯作者：
Sarty, G
中科院分区：
文献类型：
--
作者：
Borowsky, R;Loehr, J;Sarty, G
对知觉和认知过程的模块化的研究通常指出，取决于刺激和任务的性质，大脑皮质通路存在腹侧-背侧区别。然而，尚不清楚背侧、枕顶-顶流是否专门定位视觉对象(即，“在哪里”的流)或对对象采取行动(即，“如何”流)，尽管对于专门识别视觉对象的腹侧、枕顶-顶流已有一些共识。也不清楚文字和图片处理在多大程度上是模块化的，因为到目前为止，功能成像图还没有直接解决模块化问题。在这里，我们提供了两种类型的功能成像图，它们直接显示了文字和图片刺激的处理功能的模块化和交叉性，这些任务要求对刺激(N=6名参与者)做出关于“什么是什么”、“在哪里”或“你如何与刺激互动”的决定。我们的结果揭示了一个中间背部的“How”流，以及一些与“Where”加工过程中的激活不同的模块激活区域，而文字和图片涉及沿着这些流的几个激活模块区域。
Research on the modularity of perceptual and cognitive processes has often pointed to a ventral-dorsal distinction in cortical pathways that depend upon the nature of the stimuli and the task. However, it is not clear whether the dorsal, occipital-parietal stream specializes in locating visual objects (i.e., a "where" stream), or taking action toward objects (i.e., a "how" stream), although there is some consensus for a ventral, occipital-temporal "what" stream that specializes in the identification of visual objects. It is also not clear to what extent word and picture processing are modular along these streams, as functional imaging maps to date have not addressed the modularity question directly. Here we present two types of functional imaging maps that directly show modularity and intersection of processing function for word and picture stimuli in tasks that require decisions about "what is", "where is", or "how do you interact with" a stimulus (N=6 participants). Our results reveal a middle dorsal "how" stream with some modular regions of activation that are distinct from activation during "where" processing, and that words and pictures involve several modular regions of activation along these streams.