Invariant neural subspaces maintained by feedback modulation.

ABSTRACT: Sensory systems reliably process incoming stimuli in spite of changes in context. Most recent models accredit this context invariance to an extraction of increasingly complex sensory features in hierarchical feedforward networks. Here, we study how context-invariant representations can be established by feedback rather than feedforward processing. We show that feedforward neural networks modulated by feedback can dynamically generate invariant sensory representations. The required feedback can be implemented as a slow and spatially diffuse gain modulation. The invariance is not present on the level of individual neurons, but emerges only on the population level. Mechanistically, the feedback modulation dynamically reorients the manifold of neural activity and thereby maintains an invariant

SUBMITTER: Naumann LB 

PROVIDER: S-EPMC9106332 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature