Local velocity representation: Evidence from motion adaptation

Paul R. Schrater, Eero Simoncelli

Research output: Contribution to journalArticle

Abstract

Adaptation to a moving visual pattern induces shifts in the perceived motion of subsequently viewed moving patterns. Explanations of such effects are typically based on adaptation-induced sensitivity changes in spatio-temporal frequency tuned mechanisms (STFMs). An alternative hypothesis is that adaptation occurs in mechanisms that independently encode direction and speed (DSMs). Yet a third possibility is that adaptation occurrs in mechanisms that encode 2D pattern velocity (VMs). We performed a series of psychophysical experiments to examine predictions made by each of the three hypotheses. The results indicate that: (1) adaptation-induced shifts are relatively independent of spatial pattern of both adapting and test stimuli; (2) the shift in perceived direction of motion of a plaid stimulus after adaptation to a grating indicates a shift in the motion of the plaid pattern, and not a shift in the motion of the plaid components; and (3) the 2D pattern of shift in perceived velocity radiates away from the adaptation velocity, and is inseparable in speed and direction of motion. Taken together, these results are most consistent with the VM adaptation hypothesis.

Original languageEnglish (US)
Pages (from-to)3899-3912
Number of pages14
JournalVision Research
Volume38
Issue number24
DOIs
StatePublished - Dec 1998

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Keywords

  • Adaptation
  • After effect
  • Matching
  • Motion
  • Velocity

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems

Cite this

Local velocity representation : Evidence from motion adaptation. / Schrater, Paul R.; Simoncelli, Eero.

In: Vision Research, Vol. 38, No. 24, 12.1998, p. 3899-3912.

Research output: Contribution to journalArticle

Schrater, Paul R. ; Simoncelli, Eero. / Local velocity representation : Evidence from motion adaptation. In: Vision Research. 1998 ; Vol. 38, No. 24. pp. 3899-3912.
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