The size-distance paradox is a cognitive phenomenon

Abstract

 The perceived size of a fixated object is known to be a function of the perceived fixation distance. The size-distance paradox has been posited as evidence that the perceived distance of a fixated object is, in turn, influenced by the object’s perceived size. If this is correct then it challenges a widely accepted account (modified weak fusion) of how the nervous system combines multiple sources of information. We hypothesised that the influence of perceived size on the perception of distance is likely to be restricted to conscious perceptual judgements. If our hypothesis is correct then the size-distance paradox should not be observed when observers make action-based distance judgements. In line with this expectation we observed the size-distance paradox when participants made verbal reports on target distance but found no paradoxical judgements in a group who were asked to point at the target. We therefore suggest that the size-distance paradox should not be taken as evidence that perceived size feeds back into distance perception.

This is a preview of subscription content, access via your institution.

Author information

Affiliations

Authors

Additional information

Received: 4 December 1998 / Accepted: 16 February 1999

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Mon-Williams, M., Tresilian, J. The size-distance paradox is a cognitive phenomenon. Exp Brain Res 126, 578–582 (1999). https://doi.org/10.1007/s002210050766

Download citation

Keywords

  • Nervous System
  • Posit
  • Multiple Source
  • Target Distance
  • Verbal Report