Pleasantness of touch in human glabrous and hairy skin: Order effects on affective ratings
Pleasantness of touch in human glabrous and hairy skin: Order effects on affective ratings
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DOI：
10.1016/j.brainres.2011.08.011
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发表时间：
2011-10-12
期刊：
影响因子：
2.9
通讯作者：
Wessberg, Johan
中科院分区：
文献类型：
--
作者：
Loken, Line S.;Evert, Mika;Wessberg, Johan
触觉包括辨别触觉和情感触觉。最近，人类多毛皮肤中的低阈值无髓鞘机械传入(C触觉，CT)与愉悦的触觉有关。在这里，我们研究了触觉刺激的享乐性方面的知觉在手臂有毛皮肤和手掌无毛皮肤之间的不同，手掌无毛皮肤没有被CT传入神经支配。当我们在手掌或前臂上以0.1cm30 cm/S的速度软刷时，三组天真健康的受试者(总共n=28)在视觉模拟评分(VAS)上评定愉悦感。我们采用了两种不同的实验方法：在实验1和实验2中，刺激是在时间上分开的顺序块中依次在手掌和手臂(或手臂和手掌)上递送的。在实验3中，刺激交替地在手臂和手掌上传递。我们发现，刺激呈现的顺序，手掌/手臂或手臂/手掌，对不同速度的温和笔触的愉悦度有影响。值得注意的是，对手掌刺激的愉悦感受到先前手臂刺激的影响，但反之亦然。因此，触觉效价的评估可能会受到激活CT传入通路所引发的情感反应的影响。(C)2011爱思唯尔B.V.保留所有权利。
The tactile sense comprises pathways for both discriminative and affective touch. Low threshold unmyelinated mechanoafferents (C tactile, CT) in the human hairy skin have recently been linked to pleasant touch sensation. Here, we investigated how perception of the hedonic aspect of tactile stimulation differs between the hairy skin of the arm, and the glabrous skin of the palm, which is not innervated by CT afferents. Three groups of nave, healthy subjects (total n=28) rated pleasantness on a visual analogue scale (VAS) when we stroked with a soft brush with speeds from 0.1 to 30 cm/s on the palm or forearm. We used two different experimental approaches: in experiments 1 and 2, stimuli were delivered successively on the palm and arm (or arm and palm) in temporally separate sequential blocks. In experiment 3, stimuli were delivered alternately on arm and palm. We found that the order of stimulus presentation, palm/arm or arm/palm, has an effect on pleasantness ratings of gentle brush stroking with varying velocity. Notably, the perception of pleasantness for palm stimulation was affected by previous stimulation of the arm, but not vice versa. Thus, assessment of valence of touch may be influenced by affective reactions elicited by activation of the CT afferent pathway. (C) 2011 Elsevier B.V. All rights reserved.