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Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane
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Curvature coding is tuned for motion direction.

Elena Gheorghiu1, Frederick Kingdom, Rickul Varshney

  • 1Laboratory of Experimental Psychology, University of Leuven, Leuven, Belgium. elena.gheorghiu@psy.kuleuven.be

Journal of Vision
|April 10, 2010
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Summary
This summary is machine-generated.

Curvature coding mechanisms show motion direction selectivity, especially with global motion. Local motion after-effects lack this direction tuning, suggesting sufficient spatio-temporal stimulus coverage is key for psychophysical manifestation.

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Area of Science:

  • Visual perception
  • Neuroscience
  • Computational vision

Background:

  • Curvature after-effects, such as the shape-frequency after-effect (SFAE) and shape-amplitude after-effect (SAAE), are thought to arise from curvature-sensitive neural mechanisms.
  • These after-effects involve adaptation to a contour's shape, leading to a perceived shift in a test contour's shape-frequency or shape-amplitude.

Purpose of the Study:

  • To investigate the motion tuning properties of curvature coding mechanisms.
  • To differentiate between global and local motion processing in relation to curvature after-effects.
  • To determine the influence of motion direction, shape temporal frequency, and luminance temporal frequency on curvature after-effects.

Main Methods:

  • Utilized two shape after-effects: shape-frequency after-effect (SFAE) and shape-amplitude after-effect (SAAE).
  • Compared global motion (drifting sinusoidal contours) and local motion (moving Gabor elements) conditions.
  • Assessed motion direction selectivity by using adaptor and test contours moving in same or opposite directions.

Main Results:

  • Global motion conditions revealed that both SFAE and SAAE exhibit selectivity to motion direction.
  • In the global motion condition, after-effects increased with shape temporal frequency, particularly when adaptor and test contours moved in the same direction.
  • Local motion after-effects were not selective to motion direction and did not increase with luminance temporal frequency.

Conclusions:

  • Curvature is likely encoded by mechanisms that are selective to motion direction.
  • Directional selectivity of curvature coding is most apparent psychophysically under conditions with adequate spatio-temporal stimulus coverage.
  • The findings highlight the distinct roles of global versus local motion processing in curvature perception.