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Y Bonneh, U Polat, D Sagi; Inter-ocular Lateral Interactions Are Both Excitatory And Inhibitory . Invest. Ophthalmol. Vis. Sci. 2002;43(13):4720.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: To explore spatial interactions between the eyes in contrast detection. Methods: Contrast detection thresholds (Temporal 2AFC, 50 ms each presentation) were measured for each eye, for vertical Gabor targets (3 cpd) in isolation and in the presence of laterally placed (2-12λ from target) collinear Gabor flankers (C=30%) of the same spatial-frequency, presented to the same eye or to different eyes. Inter-ocular transfer of the McCollogh effect (MCE) was tested by adapting one eye to red-horizontal /green-vertical line patterns and testing the other eye for transfer of the adaptation effect. Results: Detection was facilitated in the presence of flankers presented to the same eye, with separation of 2-6λ (0.2 log units on average, 16 eyes). However, the pattern of inter-ocular masking varied between observers (N=8). Four observers showed range-limited (up to 4λ) suppression between the eyes. The other observers had no suppression or small facilitation, with one observer having clear inter-ocular facilitation (0.17 log units). The observers who showed inter-ocular suppression showed no transfer of the MCE between the eyes (N=4); 3 other observers showed some transfer. One observer that showed inter-ocular facilitation in masking described strong transfer of the MCE. Conclusion: Both excitatory and inhibitory range-limited spatial interactions could be observed between the eyes. The balance between these interactions varies between observers. Strong inter-ocular suppression appears to degrade inter-ocular integration as reflected in the lack of transfer of the MCE.
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