Coincidence detection and changes of synaptic efficacy in spiny stellate 
neurons in rat barrel cortex

Egger, Veronica; Feldmeyer, Dirk; Sakmann, Bert

doi:10.1038/16026

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Coincidence detection and changes of synaptic efficacy in spiny stellate neurons in rat barrel cortex

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Egger, Veronica
Department of Cell Physiology, Max Planck Institute for Medical Research, Max Planck Society;

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Feldmeyer, Dirk
Department of Cell Physiology, Max Planck Institute for Medical Research, Max Planck Society;

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Sakmann, Bert
Department of Cell Physiology, Max Planck Institute for Medical Research, Max Planck Society;

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http://www.nature.com/neuro/journal/v2/n12/pdf/nn1299_1098.pdf
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http://dx.doi.org/10.1038/16026
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Citation

Egger, V., Feldmeyer, D., & Sakmann, B. (1999). Coincidence detection and changes of synaptic efficacy in spiny stellate neurons in rat barrel cortex. Nature Neuroscience, 2(12), 1098-1105. doi:10.1038/16026.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0024-9C62-C

Abstract

Paired whole-cell voltage recordings were made from synaptically connected spiny stellate neurons in layer 4 of the barrel field in young (P14) rat somatosensory cortex. When postsynaptic action potentials (APs) followed each of 5 presynaptic APs in a 10- or 20-Hz train by less than 25 ms, subsequent unitary EPSP amplitudes were persistently reduced. Induction of long-term depression (LTD) depended on activation of group II metabotropic glutamate receptors, but not on NMDA or AMPA receptors. Reducing postsynaptic increases in intracellular calcium ([Ca2+]i) by intracellular loading with a fast- (BAPTA) or a slow- (EGTA) acting Ca2+ buffer blocked synaptic depression. Analysis of EPSP failures suggested mediation of LTD by a reduction in release probability. We propose a mechanism by which coincident activity results in long-lasting reduction of synaptic efficacy between synaptically connected neurons