June 2006
Volume 6, Issue 6
Vision Sciences Society Annual Meeting Abstract  |   June 2006
Pursuit eye movements to isoluminant targets
Author Affiliations
  • Doris I. Braun
    Psychology, Giessen University, Giessen, Germany
  • Neil Mennie
    Psychology, Giessen University, Giessen, Germany
  • Karl R. Gegenfurtner
    Psychology, Giessen University, Giessen, Germany
Journal of Vision June 2006, Vol.6, 3. doi:https://doi.org/10.1167/6.6.3
  • Views
  • Share
  • Tools
    • Alerts
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      Doris I. Braun, Neil Mennie, Karl R. Gegenfurtner; Pursuit eye movements to isoluminant targets. Journal of Vision 2006;6(6):3. doi: https://doi.org/10.1167/6.6.3.

      Download citation file:

      © ARVO (1962-2015); The Authors (2016-present)

  • Supplements

Isoluminant stimuli are perceived to be moving slower than comparable luminance stimuli.Here we investigate whether smooth pursuit eye movements show an analogous slowing.

Eye movements were measured with a Purkinje image eye tracker while viewing 1 cpd sine wave gratings or small Gaussian spots of light that moved at four different speeds between 1 and 8 deg/s. Pursuit was determined in response to targets defined by luminance contrast (10%) and compared to pursuit for targets at or near the point of isoluminance. We obtained similar pursuit eye movements for both types of targets. Steady state eye speed was reduced by about 10% for isoluminant targets only at high temporal frequencies. Eye movement acceleration was not affected. The biggest difference was obtained with respect to latency which was 30 to 80 ms longer at isoluminance. Compared to the dramatic slowing of 30% or more that we observed psychophysically with these stimuli, there was hardly any impairment for steady state pursuit eye movements. Furthermore, the largest effects for pursuit were obtained at high temporal frequencies, where no perceptual slowing of isoluminant stimuli was found. At low temporal frequencies, eye movement steady state speed was not affected, even though the same stimuli were sometimes perceived at 30% of their veridical speed when subjects were fixating. When psychophysical judgments are made during pursuit, speed is perceived veridical for all stimuli. We conclude that the mechanisms that cause the perceptual slowing of isoluminant gratings are not involved in the generation of pursuit eye movements.

Braun, D. I. Mennie, N. Gegenfurtner, K. R. (2006). Pursuit eye movements to isoluminant targets [Abstract]. Journal of Vision, 6(6):3, 3a, http://journalofvision.org/6/6/3/, doi:10.1167/6.6.3. [CrossRef]
 Supported by: Deutsche Forschungsgemeinschaft GE 879/7

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.