Contralateral tactile masking between forearms

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• 作者：Sarah D’Amour (1) (2)
  Laurence R. Harris (1)
  
• 关键词：Long ; range masking ; Somatosensory sensitivity ; Tactile detection thresholds ; QUEST ; Somatosensory psychophysics ; Cross ; body tactile inhibition
• 刊名：Experimental Brain Research
• 出版年：2014
• 出版时间：March 2014
• 年：2014
• 卷：232
• 期：3
• 页码：821-826
• 全文大小：321 KB
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• 作者单位：Sarah D’Amour (1) (2)
  Laurence R. Harris (1)
  
  1. Centre for Vision Research, York University, Toronto, ON, Canada
  2. Department of Psychology, York University, 4700 Keele St, Toronto, ON, M3J 1P3, Canada
  
• ISSN：1432-1106

文摘

Masking effects have been demonstrated in which tactile sensitivity is affected when one touch is close to another on the body surface. Such effects are likely a result of local lateral inhibitory circuits that sharpen the spatial tuning of a given tactile receptor. Mutually inhibitory pathways have also been demonstrated between cortical tactile maps of the two halves of the body. Occasional reports have indicated that touches on one hand or forearm can affect tactile sensitivity at contralateral locations. Here, we measure the spatial tuning and effect of posture on this contralateral masking effect. Tactile sensitivity was measured on one forearm, while vibrotactile masking stimulation was applied to the opposite arm. Results were compared to sensitivity while vibrotactile stimulation was applied to a control site on the right shoulder. Sensitivity on the forearm was reduced by over 3?dB when the arms were touching and by 0.52?dB when they were held parallel. The masking effect depended on the position of the masking stimulus. Its effectiveness fell off by 1 STD when the stimulus was 29?% of arm length from the corresponding contralateral point. This long-range inhibitory effect in the tactile system suggests a surprisingly intimate relationship between the two sides of the body.