A Mechanistic Account of Dedifferentiation in the Aging Visual System

Simulated neural degradation in the ventral visual stream shows that severing connections or adding noise in IT or upstream reduces IT differentiation, including place selectivity.

• Why it matters: Age-related dedifferentiation in the visual system is not well explained mechanistically, and it is unclear whether it starts locally in inferotemporal cortex or elsewhere.
• What they did: A computational model of the ventral visual stream was used to mimic degradation by severing connections or adding noise in IT or upstream, and by degrading peripheral V1.
• The result: Dedifferentiation is linked to upstream or connectivity disruption rather than requiring local IT origin, and peripheral V1 degradation selectively reduces place differentiation, supporting a mechanism for stronger place dedifferentiation in aging.

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