Perceiving what is reachable depends on motor representations: evidence from a transcranial magnetic stimulation study.
Perceiving what is reachable depends on motor representations: evidence from a transcranial magnetic stimulation study.
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DOI：
10.1371/journal.pone.0002862
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发表时间：
2008-08-06
期刊：
影响因子：
3.7
通讯作者：
Derambure P
中科院分区：
文献类型：
--
作者：
Coello Y;Bartolo A;Amiri B;Devanne H;Houdayer E;Derambure P
在视觉上确定在个人周围空间中什么是可到达的，需要关于物体以自我为中心的位置的信息，但也需要关于与身体动作的可能性的信息，这取决于上下文。本研究的目的是测试运动表征在个人周围空间视觉知觉中的作用。七名健康的参与者在执行左右决策(控制)任务或感知判断右手是否可以到达视觉目标时，接受了TMS研究。还包括一项实际的抓取运动任务。80%的受试者在左侧运动和运动前皮质和对照部位(颞枕区)、90%的静息运动阈值和不同的SOA条件(50ms、100ms、200ms或300ms)下进行单脉冲TMS。结果表明，TMS对所有任务的反应时都有促进作用，无论刺激部位是什么，直到刺激呈现后200ms。然而，在知觉判断任务中刺激运动皮质时，易化效应平均降低了34ms，尤其是对位于个人周围空间边界的刺激。这项研究提供了第一个证据，证明大脑运动区参与视觉决定什么是可及的。我们讨论了运动表征如何向知觉系统提供与附近物体可能相互作用的信息，从而可能有助于感知周围个人空间的边界。
Visually determining what is reachable in peripersonal space requires information about the egocentric location of objects but also information about the possibilities of action with the body, which are context dependent. The aim of the present study was to test the role of motor representations in the visual perception of peripersonal space. Seven healthy participants underwent a TMS study while performing a right-left decision (control) task or perceptually judging whether a visual target was reachable or not with their right hand. An actual grasping movement task was also included. Single pulse TMS was delivered 80% of the trials on the left motor and premotor cortex and on a control site (the temporo-occipital area), at 90% of the resting motor threshold and at different SOA conditions (50ms, 100ms, 200ms or 300ms). Results showed a facilitation effect of the TMS on reaction times in all tasks, whatever the site stimulated and until 200ms after stimulus presentation. However, the facilitation effect was on average 34ms lower when stimulating the motor cortex in the perceptual judgement task, especially for stimuli located at the boundary of peripersonal space. This study provides the first evidence that brain motor area participate in the visual determination of what is reachable. We discuss how motor representations may feed the perceptual system with information about possible interactions with nearby objects and thus may contribute to the perception of the boundary of peripersonal space.
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影响因子：
2.6
作者：
Ashbridge, E;Walsh, V;Cowey, A
通讯作者：
Cowey, A
影响因子：
3.7
作者：
Gerardin, E;Sirigu, A;Le Bihan, D
通讯作者：
Le Bihan, D
DOI：
10.3758/bf03193675
发表时间：
2006-02-01
期刊：
PERCEPTION & PSYCHOPHYSICS
影响因子：
--
作者：
Coello, Y;Iwanow, O
通讯作者：
Iwanow, O
影响因子：
2.1
作者：
Fischer, MH
通讯作者：
Fischer, MH
影响因子：
2.4
作者：
Coello, Yann;Delevoye-Turrell, Yvonne
通讯作者：
Delevoye-Turrell, Yvonne