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.
Bibliographical noteCreative Commons Attribution Non-Commercial No Derivatives License
- interocular suppression
- dichoptic masking
Huang, P-C., Baker, D., & Hess, R. F. (2012). Interocular suppression in normal and amblyopic vision: spatio-temporal properties. Journal of Vision, 12(11), 1-12. . https://doi.org/10.1167/12.11.29