RT Journal Article
SR Electronic
T1 Cortical subnetworks encode context of visual stimulus
JF bioRxiv
FD Cold Spring Harbor Laboratory
SP 452219
DO 10.1101/452219
A1 Jordan P. Hamm
A1 Yuriy Shymkiv
A1 Shuting Han
A1 Weijian Yang
A1 Rafael Yuste
YR 2018
UL http://biorxiv.org/content/early/2018/10/25/452219.abstract
AB Cortical processing of sensory events is significantly influenced by context. For instance, a repetitive or redundant visual stimulus elicits attenuated cortical responses, but if the same stimulus is unexpected or “deviant”, responses are augmented. This contextual modulation of sensory processing is likely a fundamental function of neural circuits, yet an understanding of how it is computed is still missing. Using holographic two-photon calcium imaging in awake animals, here we identify three distinct, spatially intermixed ensembles of neurons in mouse primary visual cortex which differentially respond to the same stimulus under separate contexts, including a subnetwork which selectively responds to deviant events. These non-overlapping ensembles are distributed across layers 2-5, though deviance detection is more common in superficial layers. Contextual preferences likely arise locally since they are not present in bottom up inputs from the thalamus or top-down inputs from prefrontal cortex. The functional parcellation of cortical circuits into independent ensembles that encode stimulus context provides a circuit basis underlying cortically based perception of novel or redundant stimuli, a key deficit in many psychiatric disorders.One Sentence Summary Visual cortex represents deviant and redundant stimuli with separate subnetworks.