The Tactile Perception of Size: Some Relationships with Distance and Direction

Abstract

The results of a series of experiments carried out by Bartley (1953) demonstrated a tendency for the size of a tactually perceived object to be underestimated with increased distance of the object from the eyes. He took this to indicate that visual imagery played a part in the spatial organization of tactile data. In the present investigation this effect of distance was further examined under various conditions with sighted and blind subjects. The tendency was found to exist, but there is clear evidence that it is not due to the participation of visual imagery. No hypothesis was found to explain the tendency adequately. An interesting difference emerges between the situation where the subject extends his arm when making the comparison and that in which the arm is retracted when making the comparison.