Functional organization of intrinsic and feedback presynaptic inputs in the primary visual cortex

Proceedings of the National Academy of Sciences of the United States of America
Qing-Fang ZhangMu-Ming Poo

Abstract

In the primary visual cortex (V1) of many mammalian species, neurons are spatially organized according to their preferred orientation into a highly ordered map. However, whether and how the various presynaptic inputs to V1 neurons are organized relative to the neuronal orientation map remain unclear. To address this issue, we constructed genetically encoded calcium indicators targeting axon boutons in two colors and used them to map the organization of axon boutons of V1 intrinsic and V2-V1 feedback projections in tree shrews. Both connections are spatially organized into maps according to the preferred orientations of axon boutons. Dual-color calcium imaging showed that V1 intrinsic inputs are precisely aligned to the orientation map of V1 cell bodies, while the V2-V1 feedback projections are aligned to the V1 map with less accuracy. Nonselective integration of intrinsic presynaptic inputs around the dendritic tree is sufficient to reproduce cell body orientation preference. These results indicate that a precisely aligned map of intrinsic inputs could reinforce the neuronal map in V1, a principle that may be prevalent for brain areas with function maps.

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Citations

Jan 12, 2020·Brain Structure & Function·Kathleen S Rockland
Jun 20, 2020·Annual Review of Vision Science·Farran Briggs
Feb 2, 2021·ELife·Hedi YoungLeopoldo Petreanu
Jun 14, 2021·Journal of Neuroscience Methods·Gerard Joey Broussard, Leopoldo Petreanu

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