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Visual motion transforms visual space representations similarly throughout the human visual hierarchy.

Ben M Harvey1, Serge O Dumoulin2

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Visual motion alters neural receptive fields and perceived location across the human visual hierarchy. These motion-induced changes in visual processing are similar across different visual areas and may stem from basic neural mechanisms.

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Computational Neuroscience

Background:

  • Visual stimulus motion influences neural receptive fields and fMRI responses.
  • Understanding these effects across the visual hierarchy is crucial for mapping visual processing.

Purpose of the Study:

  • To investigate the impact of visual motion on neural position preferences throughout the human visual cortex hierarchy.
  • To compare neural changes with perceptual displacements caused by visual motion.

Main Methods:

  • Utilized high-field functional magnetic resonance imaging (fMRI) at 7 Tesla to measure population receptive field (pRF) properties.
  • Employed sine wave gratings moving at various speeds in different directions to assess pRF changes.
  • Demonstrated perceptual displacements using identical stimulus configurations.

Main Results:

  • Observed direction- and speed-dependent changes in pRF preferred position and size across visual areas (V1, V3A, TO1).
  • Found that these effects intensify higher up the visual hierarchy but scale with pRF size.
  • Perceptual displacements showed speed-independent effects, contrasting with neural changes.

Conclusions:

  • Visual motion induces consistent transformations in visuo-spatial representations throughout the visual hierarchy.
  • These transformations may be explained by underlying low-level neural mechanisms.
  • Neural and perceptual effects of visual motion differ in their speed dependency.