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Neuron. 2002 Feb 14;33(4):625-33.

Tonic and spillover inhibition of granule cells control information flow through cerebellar cortex.

Author information

1
Department of Physiology, University College London, Gower Street, WC1E 6BT, London, United Kingdom.

Abstract

We show that information flow through the adult cerebellar cortex, from the mossy fiber input to the Purkinje cell output, is controlled by furosemide-sensitive, diazepam- and neurosteroid-insensitive GABA(A) receptors on granule cells, which are activated both tonically and by GABA spillover from synaptic release sites. Tonic activation of these receptors contributes a 3-fold larger mean inhibitory conductance than GABA released synaptically by high-frequency stimulation. Tonic and spillover inhibition reduce the fraction of granule cells activated by mossy fiber input, generating an increase of coding sparseness, which is predicted to improve the information storage capacity of the cerebellum.

PMID:
11856535
DOI:
10.1016/s0896-6273(02)00593-7
[Indexed for MEDLINE]
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