Cite as:
Lechelt E C, 1988, "Spatial asymmetries in tactile discrimination of line orientation: a comparison of the sighted, visually impaired, and blind" Perception 17(5) 579 – 585
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Spatial asymmetries in tactile discrimination of line orientation: a comparison of the sighted, visually impaired, and blind

Eugene C Lechelt

Received 1 September 1987, in revised form 23 July 1988

Abstract. Thresholds for tactile discrimination of stimulus orientation discrepancy from standard or referent vertical, horizontal, and diagonal orientations were determined for sighted, visually impaired, and blind subject groups. The stimuli were presented to the ventral distal portion of the tip of the subject's left index finger via an Optacon. Although the subject groups did not differ in overall discrimination accuracy, for each group the deviations from vertical and horizontal standard orientations were discriminated reliably more accurately than the deviations from standard diagonals, ie the oblique effect was obtained. The bases for this tactual spatial anisotropic effect appear to reflect both sensory-neurological and experiential factors.

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