曲线两端点距离的触觉辨别

TACTILE DISCRIMINATION OF DISTANCE BETWEEN TWO END-POINTS OF A CURVED LINE

在被动触觉实验中,被试的手保持不动,将各种弦长和弧高的曲线刺激轻轻接触食指腹侧或以一定速度通过其表面,要求被试判定曲线两端点的直线距离,在一根量尺上复现出来。结果发现:(1)当曲线刺激快速通过皮肤表面时,其两端点的知觉距离小于静止和慢速运动条件下的知觉距离,出现时空相互作用;(2)曲线的弧高(曲率)对其两端点的知觉距离有重要影响,弧高大的会导致较小的知觉距离,弧高小的则会导致较大的知觉距离;这种弧高的影响可称作“弧线效应”,其存在不依赖于曲线刺激的运动状态。作者联系两点距离辨别中可能应用的启发式策略来讨论实验结果。

A set of metalic curved lines was used as stimuli which either tou- ched upon or moved with fast or slow speed across the index finger pad which remained immobile. Six subjects were tested. Their task was to ju- dge the distance between two end-points of the curved line and to repro- duce it on a rule. The basic findings were as follows: Ⅰ. The distance was always underestimated at fast speed, while it could be more accu- rately estimated at slow speed or at immobility ; the apparent dista...