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Reduced surround suppression in monocular motion perception.

Sandra Arranz-Paraíso1,2, Jenny C A Read3,4, Ignacio Serrano-Pedraza1,3,5

  • 1Faculty of Psychology, Universidad Complutense de Madrid, Madrid, Spain.

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Summary
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Binocular viewing significantly enhances surround suppression in motion perception compared to monocular viewing. This finding suggests altered binocular processing may underlie deficits in clinical populations.

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Area of Science:

  • Neuroscience
  • Vision Science
  • Psychophysics

Background:

  • Motion discrimination is impaired for large stimuli at high contrast and short durations.
  • This impairment is linked to center-surround suppression in neurons of visual area MT.
  • Area MT neurons show stronger responses to binocular than monocular stimulation.

Purpose of the Study:

  • To investigate surround suppression strength under binocular versus monocular viewing conditions.
  • To determine if binocular viewing influences the magnitude of surround suppression in motion perception.
  • To explore the implications for understanding neural mechanisms in area MT and clinical populations.

Main Methods:

  • Thirty-nine participants completed two experiments involving binocular and monocular viewing.
  • Duration thresholds for discriminating motion of small and large drifting gratings were measured.
  • A Motion Suppression Index (MSI) was calculated by comparing thresholds for large versus small stimuli.

Main Results:

  • Surround suppression strength, measured by MSI, was significantly higher under binocular viewing (0.249 ± 0.126 log10 ms) compared to monocular viewing (0.139 ± 0.137 log10 ms).
  • The binocular MSI was 1.79 times higher than the monocular MSI.
  • This effect exceeded explanations based solely on increased perceived contrast.

Conclusions:

  • Binocular viewing amplifies surround suppression in motion perception.
  • This amplified suppression is likely mediated by neural mechanisms in area MT.
  • Altered binocular processing could explain differences in surround suppression observed in clinical populations.