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Influence of Subcortical Inhibition on Barrel Cortex Receptive Fields
Journal article   Open access   Peer reviewed

Influence of Subcortical Inhibition on Barrel Cortex Receptive Fields

Akio Hirata, Juan Aguilar and Manuel A Castro-Alamancos
Journal of neurophysiology, v 102(1), pp 437-450
Jul 2009
DOI: https://doi.org/10.1152/jn.00277.2009
PMID: 19403743
url
https://doi.org/10.1152/jn.00277.2009View
Published, Version of Record (VoR) Open

Abstract

Influence of subcortical inhibition on barrel cortex receptive fields. By the time neural responses driven by vibrissa stimuli reach the barrel cortex, they have undergone significant spatial and temporal transformations within subcortical relays. A major regulator of these transformations is thought to be subcortical GABA-mediated inhibition, but the actual degree of this influence is unknown. We used disinhibition produced by GABA receptor antagonists to unmask the excitatory sensory responses that are normally suppressed by inhibition in the main subcortical sensory relays to barrel cortex; principal trigeminal (Pr5) and primary thalamic (VPM) nuclei. We found that, within subcortical relays, inhibition only slightly suppresses short-latency receptive field responses, but robustly suppresses long-latency center and surround receptive field responses. However, the long-latency subcortical effects of inhibition are mostly not reflected in the barrel cortex. The most robust effect of subcortical inhibition on barrel cortex responses is to transiently suppress the receptive field responses of high-frequency sensory stimuli. This transient adaptation caused by subcortical inhibition recovers within a few stimuli and gives way to a steady-state adaptation that is independent of subcortical inhibition.

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