Humans are experts for face processing – this expertise develops over the course of several years, given visual input about faces from infancy. Recent studies have shown that individuals can also recognize faces haptically, albeit at lower performance than visually. Given that blind individuals are extensively trained on haptic processing, one may expect them to perform better at recognizing faces from touch than sighted individuals. Here, we tested this hypothesis using matched groups of sighted, congenitally blind, and acquired-blind individuals. Surprisingly, we found little evidence for a performance benefit for blind participants compared with sighted controls. Moreover, the congenitally blind group performed significantly worse than both the sighted and the acquired-blind group. Our results are consistent with the hypothesis that visual expertise may be necessary for haptic face recognition; hence, even extensive haptic training cannot easily account for deficits in visual processing.
aDepartment of Brain and Cognitive Engineering, Korea University, Seoul, Korea
bDepartment of Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Tübingen, Germany
Correspondence to Christian Wallraven, Dr rer nat, Department of Brain and Cognitive Engineering, Korea University, Anam-Dong 5ga, Seongbuk-gu, Seoul 136-713, Korea Tel/fax: +82 2 3290 5925; e-mail: firstname.lastname@example.org
Received January 1, 2013
Accepted January 14, 2013