Faculty Opinions recommendation of Eye-specific effects of binocular rivalry in the human lateral geniculate nucleus.

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Abstract
This study reveals a strong effect of binocular rivalry at a surprisingly early stage of visual processing. Through careful fMRI (functional magnetic resonance imaging) measurements, the authors monitored the activity of the lateral geniculate nucleus (LGN) in humans that were observing a rivalrous stimulus. In such a stimulus, one eye sees a pattern that is incompatible with the one seen by the other eye. The resulting percept alternates randomly between patterns. The present study reveals that the switches in perception are clearly associated with switches in LGN activation. This result confirms the one obtained independently and contemporaneously by a separate group {1}. It raises a number of questions, especially because it appears to be in strong contradiction with an earlier electrophysiological study that found no effect of rivalry on the responses of individual LGN neurons in behaving primates {2}.

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