Sanders Abram F J, Kappers Astrid M L
Human Perception, The Physics of Man, Helmholtz Institute, Utrecht University, P.O. Box 80000, 3508 TA Utrecht, The Netherlands.
Acta Psychol (Amst). 2008 Nov;129(3):340-51. doi: 10.1016/j.actpsy.2008.08.011. Epub 2008 Oct 2.
One possible way of haptically perceiving length is to trace a path with one's index finger and estimate the distance traversed. Here, we present an experiment in which observers judge the lengths of paths across cylindrically curved surfaces. We found that convex and concave surfaces had qualitatively different effects: convex lengths were overestimated, whereas concave lengths were underestimated. In addition, we observed that the index finger moved more slowly across the convex surface than across the concave one. As a result, movement times for convex lengths were longer. The considerable correlation between movement times and length estimates suggests that observers take the duration of movement as their primary measure of perceived length, but disregard movement speeds. Several mechanisms that could underlie observers' failure to account for speed differences are considered.
一种通过触觉感知长度的可能方式是用食指沿着一条路径移动并估计走过的距离。在此，我们展示了一个实验，其中观察者判断在圆柱曲面上的路径长度。我们发现凸面和凹面有质的不同影响：凸面长度被高估，而凹面长度被低估。此外，我们观察到食指在凸面上移动比在凹面上移动更慢。因此，凸面长度的移动时间更长。移动时间与长度估计之间的显著相关性表明，观察者将移动持续时间作为感知长度的主要度量，但忽略了移动速度。我们考虑了几种可能导致观察者未能考虑速度差异的机制。
