Evidence of vibrotactile input to human auditory cortex
Evidence of vibrotactile input to human auditory cortex
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DOI：
10.1016/j.neuroimage.2005.07.023
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发表时间：
2006-01-01
期刊：
影响因子：
5.7
通讯作者：
Jousmäki, V
中科院分区：
文献类型：
--
作者：
Caetano, G;Jousmäki, V
触觉系统和听觉系统都可以检测到低频振动。本研究的目的是通过全头皮脑磁图(MEG)来发现，单靠振动触觉刺激是否会激活人的听觉皮质区域。我们记录了从11名听力正常的成年人到200赫兹振动(平均比个人触觉检测阈值高19.5分贝)传递到右手指尖的脑磁图信号。所有受试者都报告说，当他们触摸振动管时，他们感觉到了声音，而当他们没有接触振动管时，他们报告说什么都没有感觉到。在10名受试者中，振动触觉刺激产生了清晰且可重复的振动触觉诱发电场(VTEF)，而未接触管子时未观察到脑磁图反应。在所有受试者中，对振动触觉刺激的第一反应起源于初级躯体感觉皮质，峰值在60ms左右。紧随其后的是双侧(N=5)或单侧(N=5)听觉皮质的激活，以及对侧(N=3)或同侧(N=4)的次级躯体感觉皮质(SII)的激活。SII和听觉刺激均由100-200ms的瞬时反应组成。在200-700ms时，有9名受试者在双侧(N=2)或同侧(N=7)中发现了额外的听觉持续激活。我们的结果表明，在听力正常的成年人中，振动触觉输入会聚到听觉皮质，这与先前在先天性聋人中获得的结果一致。(C)2005 Elsevier Inc.保留所有权利。
Low frequency vibrations can be detected by both tactile and auditory systems. The aim of the present study is to find out, by means of whole-scalp magnetoencephalography (MEG), whether vibrotactile stimulation alone would activate human auditory cortical areas. We recorded MEG signals from eleven normal-hearing adults to 200-Hz vibrations (on average 19.5 dB above the individual tactile detection threshold), delivered to right-hand fingertips. All subjects reported a perception of a sound when they touched the vibrating tube, and they reported to perceive nothing when not touching the tube. The vibrotactile stimuli elicited clear and reproducible vibrotactile evoked fields (VTEFs) in ten subjects, whereas no MEG responses were observed when the tube was not touched. First responses to the vibrotactile stimuli, peaking around 60 ms, originated in the primary somatosensory cortex in all subjects. They were followed by activations in the auditory cortices, either bilaterally (N = 5) or unilaterally (N = 5), and by activations in the secondary somatosensory (SII) cortex, either contralaterally (N = 3) or ipsilaterally (N = 4). Both the SII and auditory activations consisted of transient responses at 100-200 ms. Additional auditory sustained activation was identified in nine subjects, either bilaterally (N = 2) or ipsilaterally (N = 7), at 200-700 ms. Our results suggest convergence of vibrotactile input to the auditory cortex in normal-hearing adults, in agreement with results previously obtained in a congenitally deaf adult. (c) 2005 Elsevier Inc. All rights reserved.