Visual cortical activity during tactile perception in the sighted and the visually deprived
Visual cortical activity during tactile perception in the sighted and the visually deprived
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DOI：
10.1002/dev.20056
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发表时间：
2005-04-01
影响因子：
2.2
通讯作者：
Sathian, K
中科院分区：
文献类型：
--
作者：
Sathian, K
本文回顾了一些研究，这些研究证明了视力正常的参与者以及经历了不同时间视觉剥夺的参与者在触觉感知过程中视觉皮层的活动。这一领域在过去几年里非常活跃，结果出现了一些令人兴奋的发现，但仍然缺乏一个统一的框架。本文的第一部分涉及的调查显示，视觉皮层活动是定期与触觉输入的神经处理正常视力的个人。接下来，这种视觉皮层招聘的可能原因被认为是。然后重点转移到视觉剥夺的影响，检查视觉皮层在早期和晚期失明的感觉和语言处理的参与。最后一节介绍了一些研究，这些研究表明，即使在相当短暂的视觉剥夺之后，也可以观察到显著程度的可塑性。总的来说，视力正常的人在非视觉任务中的视觉皮层活动的性质似乎会受到迟发性失明甚至视觉输入短暂中断的影响;然而，如果视力在生命早期丧失或从未出现过，相关的神经可塑性似乎会更加旺盛，这表明存在一个关键时期，这种可塑性的最大表达。(c)2005 Wiley Periodicals，Inc.
This article reviews studies demonstrating activity in visual cortex during tactile perception in sighted participants as well as in those who have experienced visual deprivation of varying duration. This field has been very active over the last few years, with the result that a number of exciting findings have emerged, but a unifying framework is still lacking. The first section of this article deals with investigations revealing that visual cortical activity is regularly associated with the neural processing of tactile inputs in normally sighted individuals. Next, the possible reasons underlying such visual cortical recruitment are considered. The focus then shifts to the effects of visual deprivation, examining the involvement of visual cortex in sensory and language processing in the early and late blind. The final section gives an account of studies suggesting that a remarkable degree of plasticity can be observed even after quite short-lasting visual deprivation. Overall, it appears that the nature of visual cortical activity during nonvisual tasks in the sighted can be influenced by late-onset blindness and even by brief interruptions of visual input; however the relevant neural plasticity seems to considerably more exuberant if vision is lost very early in life or was never present, which suggests that there is a critical period for the maximal expression of such plasticity. (c) 2005 Wiley Periodicals, Inc.