Abstract
Excitatory effects of contralateral sound were studied in the dorsal cochlear nucleus (DCN) and compared to effects of ipsilateral sound in the same neurons. Most neurons excited by contralateral sound were also excited by ipsilateral sound. Contralateral excitation (but not ipsilateral excitation) is abolished by barbiturate anesthesia. Neurons showing contralateral and ipsilateral excitation (EE neurons) from a heterogeneous group. Response properties differed widely in such dimensions as the latent period, width of tuning curve, and spike count-intensity function. However, the neurons studied usually had similar best frequencies for contralateral and for ipsilateral tonal stimulation. Latent periods were consistently longer for contralateral tones. A few neurons, found only in unanesthetized animals, showed extremely broad tuning curves for either contralateral or ipsilateral tones. EE neurons are found predominantly in the deeper layers of the DCN.
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