Interocular suppression in normal and amblyopic vision:spatio-temporal properties

Huang, Pi-Chun; Baker, Daniel and Hess, Robert F. Interocular suppression in normal and amblyopic vision:spatio-temporal properties. Journal of Vision, 12 (11), pp. 1-12.


We measured the properties of interocular suppression in strabismic amblyopes and compared these to dichoptic masking in binocularly normal observers. We used a dichoptic version of the well-established probed-sinewave paradigm that measured sensitivity to a brief target stimulus (one of four letters to be discriminated) in the amblyopic eye at different times relative to a suppression-inducing mask in the fixing eye. This was done using both sinusoidal steady state and transient approaches. The suppression-inducing masks were either modulations of luminance or contrast (full field, just overlaying the target, or just surrounding the target). Our results were interpreted using a descriptive model that included contrast gain control and spatio-temporal filtering prior to excitatory binocular combination. The suppression we measured, other than in magnitude, was not fundamentally different from normal dichoptic masking: lowpass spatio-temporal properties with similar contributions from both surround and overlay suppression.

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Divisions: Life & Health Sciences > Optometry
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Uncontrolled Keywords: interocular suppression,amblyopia,dichoptic masking,dynamic,Ophthalmology,Sensory Systems


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