Opto-locomotor reflexes of mice to reverse-phi stimuli

Laurens A.M.H. Kirkels*, Wenjun Zhang, Jacob Duijnhouwer, Richard J.A. van Wezel

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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In a reverse-phi stimulus, the contrast luminance of moving dots is reversed each displacement step. Under those conditions, the direction of the moving dots is perceived in the direction opposite of the displacement direction of the dots. In this study, we investigate if mice respond oppositely to phi and reverse-phi stimuli. Mice ran head-fixed on a Styrofoam ball floating on pressurized air at the center of a large dome. We projected random dot patterns that were displaced rightward or leftward, using either a phi or a reverse-phi stimulus. For phi stimuli, changes in direction caused the mice to reflexively compensate and adjust their running direction in the direction of the displaced pattern. We show that for reverse-phi stimuli mice compensate in the direction opposite to the displacement direction of the dots, in accordance with the perceived direction of displacement in humans for reverse-phi stimuli.

Original languageEnglish
Article number7
Pages (from-to)1-10
Number of pages10
JournalJournal of vision
Issue number2
Publication statusPublished - 1 Feb 2020


  • Illusion
  • Mice
  • Opto-locomotor reflex
  • Phi motion
  • Reverse-phi

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