Abstract
Single unit recordings were made in the dorsal cochlear nucleus (DCN) of unanesthetized, decerebrate Mongolian gerbils. Access to the gerbil DCN was obtained using a newly described approach [Frisina et al., Hearing Res. 6, 259 (1982)]. Single units, recorded with 3M NaCl filled micropipette electrodes (20 Mohm typical), were classified into three types (II, III, or IV) based on their responses to best frequency (BF) tone bursts and their rates of spontaneous discharges. Type II units have little or no spontaneous activity and are excited by BF tones at all levels above threshold. Type III units are also excited by BF tones at all levels above threshold, but have spontaneous activity rates that exceed 2.5 spikes/s. Type IV units are excited over a narrow range of sound levels near BF threshold, but are strongly inhibited at higher levels. Thus all unit types found in the unanesthetized, decerebrate cat DCN [Young and Brownell, J. Neurophysiol. 39, 282 (1976); Young and Voigt, Hearing Res. 6, 153 (1982)] are also found in gerbil. [Work supported by NIH.]
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