Postma Albert, Zuidhoek Sander, Noordzij Matthijs L, Kappers Astrid M L
Helmholtz Institute, Utrecht University, Heidelberglaan 2, 3584 CS Utrecht, The Netherlands.
Percept Psychophys. 2008 Oct;70(7):1197-206. doi: 10.3758/PP.70.7.1197.
Early-blind, late-blind, and blindfolded sighted participants were presented with two haptic allocentric spatial tasks: a parallel-setting task, in an immediate and a 10-sec delay condition, and a task in which the orientation of a single bar was judged verbally. With respect to deviation size, the data suggest that mental visual processing filled a beneficial role in both tasks. In the parallel-setting task, the early blind performed more variably and showed no improvement with delay, whereas the late blind did improve, but less than the sighted did. In the verbal judgment task, both early- and late-blind participants displayed larger deviations than the sighted controls. Differences between the groups were absent or much weaker with respect to the haptic oblique effect, a finding that reinforces the view that this effect is not of visual origin. The role of visual processing mechanisms and visual experience in haptic spatial tasks is discussed.
向早期失明、晚期失明和蒙眼的视力正常参与者呈现了两项触觉异心空间任务：一项是平行设置任务，分为即时和延迟10秒两种条件，另一项是口头判断单个杆的方向的任务。关于偏差大小，数据表明心理视觉处理在两项任务中都发挥了有益作用。在平行设置任务中，早期失明者表现出更大的变异性，且延迟后没有改善，而晚期失明者有所改善，但不如视力正常者。在口头判断任务中，早期和晚期失明参与者的偏差都比视力正常的对照组大。在触觉倾斜效应方面，各组之间没有差异或差异小得多，这一发现强化了这种效应并非源于视觉的观点。本文讨论了视觉处理机制和视觉经验在触觉空间任务中的作用。
