Bensmaïa Sliman, Hollins Mark
University of North Carolina, Chapel Hill, North Carolina, USA.
Percept Psychophys. 2005 Jul;67(5):842-54. doi: 10.3758/bf03193537.
Subjects were presented with pairs of finely textured stimuli and were instructed to rate their dissimilarity, using free magnitude estimation. The subjects also rated the stimuli along each of four textural continua: roughness, hardness, stickiness, and warmth. In subsequent experimental sessions, we used a Hall effect transducer to measure the vibrations produced in the subjects' fingertip skin as the stimuli were scanned across it. We wished to assess the extent to which the perceptual dissimilarity of the textures could be explained in terms of the perceptual dissimilarity of the vibrations they elicited in the skin. To that end, we invoked a model characterizing the Pacinian representation of a vibratory stimulus. From the model, we computed the difference in the vibratory representations of the two stimuli in each pair. We found that the bulk of the variance in perceived dissimilarity of the textures was accounted for by differences in the Pacinian representations of the vibrations they produced. Our results further suggested that the textural information conveyed by the Pacinian system concerns surface roughness and, possibly, stickiness.
研究对象被呈现出成对的质地精细的刺激物，并被要求使用自由量值估计法对它们的差异程度进行评分。研究对象还沿着粗糙度、硬度、黏性和温暖度这四个质地连续统对刺激物进行了评分。在随后的实验环节中，当刺激物在研究对象的指尖皮肤上扫描时，我们使用霍尔效应传感器来测量在其指尖皮肤中产生的振动。我们希望评估质地的感知差异在多大程度上可以根据它们在皮肤中引发的振动的感知差异来解释。为此，我们采用了一个表征振动刺激的帕西尼小体表征的模型。从该模型中，我们计算了每对刺激物的振动表征的差异。我们发现，质地感知差异的大部分方差是由它们产生的振动的帕西尼小体表征的差异所导致的。我们的结果进一步表明，帕西尼系统传达的质地信息涉及表面粗糙度，可能还有黏性。
