不同尖锐度纹理形状的摩擦触觉感知与表征研究

通过开展触觉感知不同尖锐度纹理形状的接触摩擦特性、主观认知行为和功能核磁共振试验，从皮肤的“感”、大脑的“知”和主观的“评”全面系统地对不同纹理形状的摩擦触觉感知进行了量化表征研究. 研究表明:接触摩擦力、主观评价、激活脑区面积和强度是表征摩擦触觉感知的有效参数. 触摸不同纹理表面的摩擦力中黏着摩擦力比形变摩擦力占比大，触摸平角纹理的摩擦力最大，尖角纹理的摩擦力最小. 黏着感主要受接触面积和黏着摩擦力的影响；尖锐感主要受触觉感受体所受应力和形变摩擦的影响；而舒适感受到表面摩擦机制和触觉感受体所受应力综合影响. 触觉感知纹理形状激发的大脑功能区以躯体感觉皮层为主，激活脑区主要位于中央前回和后回. 触摸过程的舒适感与激活脑区大小和强度成反比，舒适感差的纹理激发的脑区范围和强度大，且存在负激活现象. 

Tactile Perception of Texture Shape with Different Sharpness from Finger Friction to Brain Activation

In order to systematically study the tactile perception of texture shape from finger friction to brain response, skin friction, brain fMRI, and subjective cognitive experiment were carried out during fingers exploring textured surfaces. Samples with different texture shape were chosen. The results indicated that friction, subjective evaluation, activated brain range and intensity are effective parameters to represent tactile perception. The friction was constitued by adhesive friction and deformation friction during perceived the textures. The adhesive force was larger than deformation force.The order of friction force perceived different texture shape was flat shape>round shape> sharp shape. The stickiness was mainly affected by contact area and adhesive friction. The sharpness was mainly affected by stress on the tacitle receptors and deformation friction. The comfortableness was affected by the surface friction and stress on the tactile receptor. During feeling the shape texture, somatosensory cortex region were significantly activated which included precentral gyrus and postcentral gyrus. The comfortable feeling was inversely proportional to the brain range and intensity. The texture with poor comfortable feeling stimulated large brain range and intensity, meanwhile there was negative activation phenomenon.