ArticleCommunications biology2025
Two opposing yet complementary ocular dominance plasticities: thalamus strengthens the weak channel while higher cortex listens to the strong signal.
Article in Communications biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Neural mechanisms of ocular dominance plasticity in the adult brain remain elusive. Using high-resolution functional magnetic resonance imaging (fMRI) at 7 T, we investigated ocular dominance plasticity in the visual thalamus and extrastriate visual cortices in response to monocular contrast deprivation (MCD) in human adults. Short-term (3 hours) MCD enhanced the sensitivity of the deprived eye (DE) relative to the non-deprived eye (NDE) in the lateral geniculate nucleus and the ventrolateral pulvinar of the thalamus. Compared to the NDE, the DE became more sensitive in contrast detection and more dominant in binocular combination. On the other hand, MCD reduced DE relative to NDE sensitivity in extrastriate cortices, and DE relative to NDE performance in 3-D shape perception. These findings demonstrate that a homeostatic mechanism in the visual thalamus concurrently operates with a Hebbian-like mechanism in extrastriate cortices to rapidly and adaptively adjust interocular balance to disrupted binocular input.
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