Hollins Mark, Bensmaïa Sliman J
Department of Psychology,University of North Carolina at Chapel Hill, 27599, USA.
Can J Exp Psychol. 2007 Sep;61(3):184-95. doi: 10.1037/cjep2007020.
This review examines the way information about textures is captured, encoded, and processed by the somatosensory system to produce sensations of roughness/smoothness. Textures with spatial periods exceeding about 200 microm are encoded spatially, so roughness is nearly independent of the speed and direction of their movement across the skin. The information consists of spatial variations in activity among slowly adapting (SA1) mechanoreceptors, and appears to be extracted by specialized cortical neurons. Perception of the roughness of finer surfaces is mediated by detection, primarily by Pacinian afferents, of cutaneous vibrations generated when textures move across the skin. Movement is necessary to the perception of these textures, and vibrotactile adaptation interferes with it. The code is an intensitive one (i.e., the amount of activity in Pacinian afferents).
本综述探讨了体感系统捕获、编码和处理有关质地信息以产生粗糙/光滑感觉的方式。空间周期超过约200微米的质地在空间上进行编码，因此粗糙度几乎与它们在皮肤上移动的速度和方向无关。该信息由慢适应性（SA1）机械感受器之间活动的空间变化组成，并且似乎由专门的皮层神经元提取。较精细表面粗糙度的感知主要由帕西尼小体传入纤维检测质地在皮肤上移动时产生的皮肤振动来介导。对于这些质地的感知，移动是必要的，而振动触觉适应会对其产生干扰。编码是一种强度编码（即帕西尼小体传入纤维中的活动量）。
