Pursuit eye movements to second-order motion targets

Michael J. Hawken, Karl R. Gegenfurtner

Research output: Contribution to journalArticlepeer-review


We studied smooth-pursuit eye movements elicited by first-and second-order motion stimuli. Stimuli were random dot fields whose contrast was modulated by a Gaussian window with a space constant of 0.5°. For the first-order stimuli, the random dots simply moved across the screen at the same speed as the window; for the second-order stimuli the window moved across stationary or randomly flickering dots. Additional stimuli which combined first-and second-order motion cues were used to determine the degree and type of interaction found between the two types of motion stimuli. Measurements were made at slow (1°/s) and moderate (6°/s) target speeds. At a velocity of 1°/s the initiation, transition, and steady-state phases of smooth pursuit in response to second-order motion targets are severely affected when compared with the smooth pursuit of firstorder motion targets. At a velocity of 6°/s there is a small but significant deficit in steady-state pursuit of second-order motion targets but not much effect on pursuit initiation.

Original languageEnglish (US)
Pages (from-to)2282-2296
Number of pages15
JournalJournal of the Optical Society of America A: Optics and Image Science, and Vision
Issue number9
StatePublished - Sep 2001

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Computer Vision and Pattern Recognition


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