Dopaminergic modulation of receptive fields in rat sensorimotor cortex

NeuroImage
J A HospAndreas R Luft

Abstract

Dopaminergic projections to primary sensorimotor cortex (SMC) have been described anatomically, but their functional role is unknown. The objective here was to characterize how dopamine modulates the somatosensory evoked potential (SEP) and its receptive field in SMC. SEPs were evoked by median and tibial nerve stimulation and recorded using thin-film multielectrode arrays implanted epidurally over the caudal sensorimotor cortex of rats. SEP amplitudes and receptive fields were measured before and after intracortical injection of a D1- (SCH 23390) or a D2-receptor antagonist (raclopride). Both increased maximum SEP amplitudes by 107.5% and 82.1%, respectively (p<0.01), while vehicle application had no effect (5.9% change). SEP latencies and receptive fields remained unchanged. Dopamine antagonists increase the excitability of sensorimotor cortex to afferent signals. Dopamine, therefore, expectedly reduces SMC excitability thereby improving sensory signal-to-noise ratio. Dopaminergic modulation may render SMC circuitry more effective in processing sensory information from different sources.

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Citations

Mar 6, 2012·The Canadian Journal of Neurological Sciences. Le Journal Canadien Des Sciences Neurologiques·Aimee J NelsonRobert Chen
Aug 24, 2019·Brain Structure & Function·Jonas A HospM Reisert
Jun 7, 2013·Biomedizinische Technik. Biomedical Engineering·Klaus-Peter HoffmannMatthias Kirsch
Apr 7, 2021·Integrative and Comparative Biology·Matheus Macedo-Lima, Luke Remage-Healey

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