Dynamic corticothalamic modulation of the somatosensory thalamocortical circuit during wakefulness

Elaida D. Dimwamwa, Aurélie Pala, Vivek Chundru, Nathaniel C. Wright and Garrett B. Stanley ()
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Elaida D. Dimwamwa: Georgia Institute of Technology and Emory University
Aurélie Pala: Georgia Institute of Technology and Emory University
Vivek Chundru: Georgia Institute of Technology and Emory University
Nathaniel C. Wright: Georgia Institute of Technology and Emory University
Garrett B. Stanley: Georgia Institute of Technology and Emory University

Nature Communications, 2024, vol. 15, issue 1, 1-16

Abstract: Abstract The feedback projections from cortical layer 6 (L6CT) to the sensory thalamus have long been implicated in playing a primary role in gating sensory signaling but remain poorly understood. To causally elucidate the full range of effects of these projections, we targeted silicon probe recordings to the whisker thalamocortical circuit of awake mice selectively expressing Channelrhodopsin-2 in L6CT neurons. Through optogenetic manipulation of L6CT neurons, multi-site electrophysiological recordings, and modeling of L6CT circuitry, we establish L6CT neurons as dynamic modulators of ongoing spiking in the ventral posteromedial nucleus of the thalamus (VPm), either suppressing or enhancing VPm spiking depending on L6CT neurons’ firing rate and synchrony. Differential effects across the cortical excitatory and inhibitory sub-populations point to an overall influence of L6CT feedback on cortical excitability that could have profound implications for regulating sensory signaling across a range of ethologically relevant conditions.

Date: 2024
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DOI: 10.1038/s41467-024-47863-8

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