Speed can go up as well as down at low contrast: Implications for models of motion perception

Peter Thompson, Kevin Brooks, Stephen T. Hammett

Research output: Contribution to journalArticleResearchpeer-review

Abstract

It is well-known that reducing the contrast of a slow moving stimulus reduces its apparent speed. [Thompson, P. (1982). Perceived rate of movement depends on contrast. Vision Research, 22, 377-380.] report of this finding also suggested that at speeds above 8 cycles/s reducing contrast increased perceived speed. However in a later report, Stone and Thompson (1992), using a more rigorous, forced-choice procedure, failed to collect reliable data at these higher speeds. Here, we confirm that faster moving stimuli can appear to move faster than their true speed at low contrasts and we propose a physiologically plausible ratio model that unlike recent Bayesian models (e.g. Weiss, Y., Simoncelli, E. P., & Adelson, E. H. (2002). Motion illusions as optimal percepts. Nature Neuroscience, 5, 598-604) can account well for the results.

LanguageEnglish
Pages782-786
Number of pages5
JournalVision Research
Volume46
Issue number6-7
DOIs
Publication statusPublished - Mar 2006
Externally publishedYes

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Motion Perception
Neurosciences
Research

Keywords

  • Bayesian
  • Contrast
  • Motion
  • Ratio model
  • Speed

Cite this

Thompson, Peter ; Brooks, Kevin ; Hammett, Stephen T. / Speed can go up as well as down at low contrast : Implications for models of motion perception. In: Vision Research. 2006 ; Vol. 46, No. 6-7. pp. 782-786.
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Speed can go up as well as down at low contrast : Implications for models of motion perception. / Thompson, Peter; Brooks, Kevin; Hammett, Stephen T.

In: Vision Research, Vol. 46, No. 6-7, 03.2006, p. 782-786.

Research output: Contribution to journalArticleResearchpeer-review

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