Elsevier

Vision Research

Volume 141, December 2017, Pages 40-50
Vision Research

Individual differences in sensory eye dominance reflected in the dynamics of binocular rivalry

https://doi.org/10.1016/j.visres.2016.09.014Get rights and content
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Highlights

  • A large subset of observers experience imbalance between their two eyes.

  • The stronger eye is dominant longer and more frequently during binocular rivalry.

  • Large eye imbalance also predicts frequent return transitions to the dominant eye.

  • Sighting and sensory eye dominance are unrelated.

Abstract

Normal binocular vision emerges from the combination of neural signals arising within separate monocular pathways. It is natural to wonder whether both eyes contribute equally to the unified cyclopean impression we ordinarily experience. Binocular rivalry, which occurs when the inputs to the two eyes are markedly different, affords a useful means for quantifying the balance of influence exerted by the eyes (called sensory eye dominance, SED) and for relating that degree of balance to other aspects of binocular visual function. However, the precise ways in which binocular rivalry dynamics change when the eyes are unbalanced remain uncharted. Relying on widespread individual variability in the relative predominance of the two eyes as demonstrated in previous studies, we found that an observer’s overall tendency to see one eye more than the other was driven both by differences in the relative duration and frequency of instances of that eye’s perceptual dominance. Specifically, larger imbalances between the eyes were associated with longer and more frequent periods of exclusive dominance for the stronger eye. Increases in occurrences of dominant eye percepts were mediated in part by a tendency to experience “return transitions” to the predominant eye – that is, observers often experienced sequential exclusive percepts of the dominant eye’s image with an intervening mixed percept. Together, these results indicate that the often-observed imbalances between the eyes during binocular rivalry reflect true differences in sensory processing, a finding that has implications for our understanding of the mechanisms underlying binocular vision in general.

Keywords

Binocular rivalry
Sensory eye dominance
Binocular vision
Individual differences

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