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The spatial structure of feedforward information in mouse primary visual cortex

By J Zhuang, Rylan S. Larsen, Kevin T Takasaki, Naveen D Ouellette, L. Daigle Tanya, Bosiljka Tasic, Jack Waters, Hongkui Zeng, R. Clay Reid

Posted 24 Dec 2019
bioRxiv DOI: 10.1101/2019.12.24.888156

Location-sensitive and motion-sensitive units are the two major functional types of feedforward projections from lateral genicular nucleus (LGN) to primary visual cortex (V1) in mouse. The distribution of these inputs in cortical depth remains under debate. By measuring the calcium activities of LGN axons in V1 of awake mice, we systematically mapped their functional and structural properties. Although both types distributed evenly across cortical depth, we found that they differ significantly across multiple modalities. Compared to the location-sensitive axons, which possessed confined spatial receptive fields, the motion-sensitive axons lacked spatial receptive fields, preferred lower temporal, higher spatial frequencies and had wider horizontal bouton spread. Furthermore, the motion-sensitive axons showed a strong depth-dependent motion direction bias while the location-sensitive axons showed a depth-independent OFF dominance. Overall, our results suggest a new model of receptive biases and laminar structure of thalamic inputs to V1. ![Figure][1]</img> [1]: pending:yes

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