Vibrotactile adaptation enhances spatial localization
Vibrotactile adaptation enhances spatial localization
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DOI：
10.1016/j.brainres.2006.05.037
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发表时间：
2006-08-02
期刊：
影响因子：
2.9
通讯作者：
Tornmerdahl, Mark A.
中科院分区：
文献类型：
--
作者：
Tannan, Vinay;Whitsel, Barry L.;Tornmerdahl, Mark A.
一个两个间隔的强制选择跟踪程序被用来评估的影响，预暴露于振动触觉刺激（“适应”）的能力，人类受试者的空间定位随后的触觉刺激。一个25 Hz的扑动适应刺激被呈现在一个随机选择的位置内的20 mm的线性阵列横向的手背上。随后递送的两个扑动刺激被施加到沿着线性阵列的沿着不同部位;一个施加到接收适应刺激的相同部位（“标准”刺激），另一个施加到远处部位（“测试”刺激）。在每次试验后，询问受试者两种刺激中的哪一种被递送到接受适应性刺激的相同皮肤部位。在接下来的试验中，正确的反应导致标准刺激和测试刺激接触的部位之间的距离减小。4名受试者各参加10次会议。一个会话包括两组20次试验（一组在0.5秒，另一组在5秒适应刺激持续时间）。对于每一个主题，5秒的适应导致了约2倍的空间辨别性能的改善，实现以下0.5秒的适应。有人提出，改善人类振动触觉空间定位性能5秒的25 Hz的刺激是由于增强的空间functionality的全球神经元群体响应的初级躯体感觉皮层（SI），已被证明伴随着增加的持续时间的25 Hz扑动刺激传递到皮肤。(c)2006 Elsevier B. V.保留所有权利。
A two-interval forced choice tracking procedure was used to evaluate the effects of a pre-exposure to vibrotactile stimulation ("adaptation") on the capacity of human subjects to spatially localize a subsequent tactile stimulus. A 25 Hz flutter adapting stimulus was presented at a randomly selected position within a 20 mm linear array oriented transversely on the hand dorsum. Two flutter stimuli delivered subsequently were applied to different sites along the linear array; one to the same locus that received the adapting stimulation (the "standard" stimulus), the other to a distant site (the "test" stimulus). Following each trial, subjects were queried as to which of the two stimuli was delivered to the same skin site that received adapting stimulation. A correct response resulted in a reduced distance between the sites contacted by the standard and test stimuli in the following trial. Four subjects participated in 10 sessions each. A session consisted of two sets of 20 trials (one set at 0.5 s and another at 5 s adapting stimulus duration). For every subject, 5 s adaptation resulted in an approximately 2-fold improvement in spatial discrimination performance over that achieved following 0.5 s adaptation. It is proposed that the improved human vibrotactile spatial localization performance following 5 s of 25 Hz stimulation is due to enhanced spatial funneling of the global neuronal population response of primary somatosensory cortex (SI) that has been demonstrated to accompany increases in duration of 25 Hz flutter stimuli delivered to the skin. (c) 2006 Elsevier B.V. All rights reserved.