Rapidly induced auditory plasticity: The ventriloquism aftereffect
Rapidly induced auditory plasticity: The ventriloquism aftereffect
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DOI：
10.1073/pnas.95.3.869
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发表时间：
1998-02-03
影响因子：
11.1
通讯作者：
Recanzone, GH
中科院分区：
文献类型：
--
作者：
Recanzone, GH
外周和中枢损伤或知觉和运动能力改善后，皮层表征可塑性得到了很好的证明。这导致了这样的推论，即皮层表征的变化与技能习得期间的表现改善是平行的，并且解释了这些变化。也有几个皮层神经元反应特性快速诱导变化的例子，例如，通过皮质内微刺激或经典条件反射范式。腹语后效描述了在一段时间内同时暴露于空间上完全不同的声和视觉刺激后，对声刺激空间位置的感知发生了持久的转变。8度失配暴露20-30分钟足以使声学空间感知在受试者和声学频率之间产生大约相同的位移。考虑到大脑皮层对声空间的感知是必需的，腹语后效应很可能反映了声空间皮层表征的变化。行为猕猴单个皮层神经元的反应与引起腹语后效应的刺激参数的比较表明，声空间皮层表征的变化可能早在初级听觉皮层就开始了。
Cortical representational plasticity has been well documented after peripheral and central injuries or improvements in perceptual and motor abilities. This has led to inferences that the changes in cortical representations parallel and account for the improvement in performance during the period of skill acquisition, There have also been several examples of rapidly induced changes in cortical neuronal response properties, for example, by intracortical microstimulation or by classical conditioning paradigms, This report describes similar rapidly induced changes in a cortically mediated perception in human subjects, the ventriloquism aftereffect, which presumably reflects a corresponding change in the cortical representation of acoustic space, The ventriloquism aftereffect describes an enduring shift in the perception of the spatial location of acoustic stimuli after a period of exposure of spatially disparate and simultaneously presented acoustic and visual stimuli, Exposure of a mismatch of 8 degrees for 20-30 min is sufficient to shift the perception of acoustic space by approximately the same amount across subjects and acoustic frequencies. Given that the cerebral cortex is necessary for the perception of acoustic space, it is likely that the ventriloquism aftereffect reflects a change in the cortical representation of acoustic space, Comparisons between the responses of single cortical neurons in the behaving macaque monkey and the stimulus parameters that give rise to the ventriloquism aftereffect suggest that the changes in the cortical representation of acoustic space may begin as early as the primary auditory cortex.