Bilateral inhibition by glycinergic afferents in the medial superior olive

B. Grothe, Dan Sanes

Research output: Contribution to journalArticle

Abstract

1. Coincidence-detection of excitatory synaptic potentials has long been considered to be the mechanism by which medial superior olivary (MSO) neurons compute interaural time differences. Here we demonstrate the contribution of synaptic inhibition in this circuit using a gerbil brain slice preparation. 2. Nearly all cells exhibited excitatory postsynaptic potentials (EPSPs) and action potentials (APs) after stimulation of either the ipsilateral or contralateral afferent pathway. In 44% of cells, the latency of APs depended on stimulus amplitude, exhibiting shifts of 0.25-2 ms. 3. Nearly all neurons (89%) exhibited stimulus-evoked synaptic inhibition. The inhibitory effects were enhanced at greater stimulus amplitudes and were usually able to block synaptically evoked APs. In addition, APs and EPSPs were reversibly blocked by delivering the inhibitory transmitter glycine in almost all tested cells (91%). 4. In the presence of the glycine antagonist strychnine, the effects of synaptic inhibition were suppressed. 5. The stimulus level-dependent inhibitory potentials influenced the probability that an MSO neuron would fire an AP, as well as the precise timing. Therefore, the present results have implications for the processing of interaural time differences by the MSO and at higher auditory centers.

Original languageEnglish (US)
Pages (from-to)1192-1196
Number of pages5
JournalJournal of Neurophysiology
Volume69
Issue number4
StatePublished - 1993

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Action Potentials
Excitatory Postsynaptic Potentials
Neurons
Glycine
Afferent Pathways
Strychnine
Synaptic Potentials
Auditory Cortex
Gerbillinae
Evoked Potentials
Superior Olivary Complex
Brain

ASJC Scopus subject areas

  • Physiology
  • Neuroscience(all)

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Bilateral inhibition by glycinergic afferents in the medial superior olive. / Grothe, B.; Sanes, Dan.

In: Journal of Neurophysiology, Vol. 69, No. 4, 1993, p. 1192-1196.

Research output: Contribution to journalArticle

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