TMS can reveal contrasting functions of the dorsal and ventral visual processing streams
TMS can reveal contrasting functions of the dorsal and ventral visual processing streams
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DOI：
10.1007/s00221-006-0582-8
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发表时间：
2006-11-01
影响因子：
2
通讯作者：
Cowey, Alan
中科院分区：
文献类型：
--
作者：
Ellison, Amanda;Cowey, Alan
为了研究背侧和腹侧视觉处理流的功能特异性，我们使用经颅磁刺激（TMS）来短暂地破坏其中一个或另一个，同时受试者执行三项任务，涉及颜色或形状或相对位置的歧视。TMS被传递到右后顶叶皮层（PPC）或右枕叶外侧（LO）皮层，已知分别具有视觉空间和对象处理特性的区域。LO而不是PPC刺激有显着的影响反应时，当受试者被要求作出的相对形状的歧视。PPC刺激有显着的效果时，受试者被要求区分相同形状的相对位置。刺激LO也延长了位置任务的反应时间。在任何一个部位的刺激对颜色辨别都没有影响。结果进行了讨论的框架内的背侧流和腹侧流是如何解离后，他们在神经系统的患者和可能的方式，他们可能会在正常的大脑相互作用的损害。
In order to investigate the functional specificity of the dorsal and ventral visual processing steams we used transcranial magnetic stimulation (TMS) to briefly disrupt one or the other while subjects performed three tasks, involving discrimination of colour or shape or relative position. TMS was delivered over right posterior parietal cortex (PPC) or right lateral occipital (LO) cortex, regions known to have visuo-spatial and object processing properties respectively. LO but not PPC stimulation had a significant effect on reaction time when subjects were asked to make a discrimination of relative shape. PPC stimulation had a significant effect when subjects were asked to discriminate relative position of the same shapes. Stimulation of LO also lengthened reaction times on the position task. There were no effects of stimulation at either site on colour discrimination. Results are discussed within the framework of how the dorsal stream and ventral stream are dissociated following their damage in neurological patients and possible ways in which they may interact in the normal brain.