December 2002
Volume 43, Issue 13
Free
ARVO Annual Meeting Abstract  |   December 2002
Inter-ocular Lateral Interactions Are Both Excitatory And Inhibitory
Author Affiliations & Notes
  • Y Bonneh
    Neurovision Inc Ramat Gan Israel
  • U Polat
    Goldschleger Eye Research Institute Tel-Aviv University Sheba Medical Center Tel-Hashomer 52621; NeuroVision Inc Ramat-Gan Israel
  • D Sagi
    Depart of Neurobiology Weizmann Institute Rehovot Israel
  • Footnotes
    Commercial Relationships    Y. Bonneh, NeuroVision Inc. E; U. Polat, NeuroVision Inc. E; D. Sagi, None.
Investigative Ophthalmology & Visual Science December 2002, Vol.43, 4720. doi:
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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)

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Abstract

Abstract: : 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.

Keywords: 329 binocular vision/stereopsis • 368 contrast sensitivity • 586 spatial vision 
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