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1 Cellular and Systems Neurobiology, Max-Planck- Institute of Neurobiology, Martinsried, Germany
* To whom correspondence should be addressed. E-mail: ukoch{at}neuro.mpg.de.
Neurons in the inferior colliculus (IC) process acoustic information converging from inputs from almost all nuclei of the auditory brainstem. Despite its importance in auditory processing, little is known about the distribution of ion currents in IC neurons, namely the hyperpolarzation-activated current Ih. This current, as shown in neurons of the auditory brainstem, contributes to the precise analysis of temporal information. Distribution and properties of the Ih current and its contribution to membrane properties and synaptic integration were examined by current- and voltage-clamp recordings obtained from IC neurons in acute slices of rats (P17-P19). Based on firing patterns to positive current injection three basic response types were distinguished: onset, adapting and sustained firing neurons. Onset and adapting cells showed an Ih dependent depolarizing sag and had a more depolarized resting membrane potential and lower input resistance than sustained neurons. Ih amplitudes were largest in onset, medium in adapting and small in sustained neurons. Ih activation kinetics was voltage dependent in all neurons and faster in onset and adapting compared to sustained neurons. Injecting trains of simulated synaptic currents into the neurons or evoking IPSPs by stimulating the lemniscal tract showed that Ih reduced temporal summation of excitatory and inhibitory potentials in onset but not in sustained neurons. Blocking Ih also abolished after-hyperpolarization and rebound spiking. These results suggest that in a large proportion of IC cells, namely the onset and adapting neurons, Ih improves precise temporal processing and contributes to the temporal analysis of input patterns.
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