Haptic orientation perception benefits from visual experience: Evidence from early-blind, late-blind, and sighted people

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Haptic orientation perception benefits from visual experience: Evidence from early-blind, late-blind, and sighted people Powered By Docstoc
					Perception & Psychophysics
2008, 70 (7), 1197-1206
doi: 10.3758/PP.70.7.1197




                             Haptic orientation perception benefits
                             from visual experience: Evidence from
                            early-blind, late-blind, and sighted people
                                                              Albert PostmA
                                     Helmholtz Institute, Utrecht University, Utrecht, The Netherlands

                                                            sAnder Zuidhoek
                                              Visio Noord-Nederland, Haren, The Netherlands

                                                          mAtthijs l. noordZij
                                             .
                  
				
DOCUMENT INFO
Description: 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. [PUBLICATION ABSTRACT]
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