July 2019
Volume 60, Issue 9
Open Access
ARVO Annual Meeting Abstract  |   July 2019
Interocular suppression of form but not motion in dichoptic plaids
Author Affiliations & Notes
  • Amy Chow
    University of Waterloo, Waterloo, Ontario, Canada
  • Andrew Ernest Silva
    University of Waterloo, Waterloo, Ontario, Canada
  • Ben Thompson
    University of Waterloo, Waterloo, Ontario, Canada
  • Footnotes
    Commercial Relationships   Amy Chow, None; Andrew Silva, None; Ben Thompson, None
  • Footnotes
    Support  NSERC Post-Graduate Scholarship - Doctoral to AC, NSERC Discovery Grant to BT
Investigative Ophthalmology & Visual Science July 2019, Vol.60, 224. doi:
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      Amy Chow, Andrew Ernest Silva, Ben Thompson; Interocular suppression of form but not motion in dichoptic plaids. Invest. Ophthalmol. Vis. Sci. 2019;60(9):224.

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

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Abstract

Purpose : Previous studies of dichoptic plaid perception have shown that motion integration can occur between the eyes even when form information in one eye is suppressed. This suggests that suppression can have differential effects on the ventral (form) and the dorsal (motion) cortical processing streams. In this study, we sought to replicate this effect in control participants and explore whether differential suppression of the ventral and dorsal streams also occurs in amblyopia.

Methods : Participants with normal vision (n=7) and amblyopia (n=2) viewed drifting dichoptic plaids consisting of orthogonal gratings (1 cpd, 4 deg diameter, 0.25 cycles/s, 100% contrast, 60 sec duration) through a mirror stereoscope. Participants reported both form and motion percepts as the gratings underwent binocular rivalry. Form percepts were categorized as “single grating left oblique”, “single grating right oblique” or “piecemeal”. The perceived motion direction was reported continuously using a mouse cursor. Each participant completed 48 trials.

Results : Participants with normal binocular vision reported consistent form and motion percepts 75±7% (SEM) of the time, integrated motion with one eye suppressed 9±3% of the time and piecemeal form with component motion 7±3% of the time. No bias in percept dominance was evident between the eyes (dominant eye 8%; non-dominant eye 8%).

Both participants with amblyopia exhibited a strong bias for the dominant eye in form perception (participant #1: fellow eye 42%, amblyopic eye 0%; participant #2: fellow eye 50%, amblyopic eye 11%). Consistent form and motion percepts were reported 57% and 90% of the time. Notably, both participants perceived integrated motion when the amblyopic eye was suppressed (18% and 5% of the time respectively) and piecemeal with component motion 25% and 4% of the time.

Conclusions : Our initial observations suggest that dorsal and ventral streams are differentially affected by interocular suppression in participants with normal binocular vision and amblyopia. This raises the possibility that amblyopic eyes may provide useful information to the dorsal stream when they are perceptually suppressed.

This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.

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