Visual tuning to kinematics of biological motion: the role of eye movements

Claudio de'Sperati, Natale Stucchi

Research output: Contribution to journalArticlepeer-review


The visual system is particularly sensitive to the covariation between velocity and curvature that constraint biological motion. Previous work showed that, when this biological constraint is satisfied, simple elliptical motion of a dot looks constant, although its velocity is highly non-uniform. This paper addresses the hypothesis that such a dynamic illusion is dependent upon smooth pursuit eye movements. Subjects had to adjust the kinematics of a dot moving along elliptical trajectories until they perceived a constant velocity. Different pursuit and fixation conditions were tested. The research shows that the dynamic illusion is largely independent of eye movements, suggesting that the visual system has access to implicit knowledge of motor constraints regardless of the concurrent oculomotor commands.

Original languageEnglish
Pages (from-to)254-260
Number of pages7
JournalExperimental Brain Research
Issue number2
Publication statusPublished - Aug 1995


  • Eye movements
  • Implicit knowledge
  • Motor control
  • Perceptuo-motor interactions
  • Visual perception

ASJC Scopus subject areas

  • Neuroscience(all)

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