| Abstract: | Investigation of single unit responses in the ventral cochlear nucleus of the Rhinolophidae to ultrasonic stimuli after destruction of the ipsilateral cochlea revealed two groups of neurons with latent periods of: 1) 2–4 msec and 2) 5–32 msec. The first group has responses of low thresholds confined to narrow regions of the spectrum, the second has responses with high thresholds in wide regions. Neurons of the second group are also characterized by small changes in latent period and number of action potentials in response to a change in stimulus strength, large changes in threshold at characteristic frequencies depending on the stimulus duration, but only slight dependence of the thresholds on the time of the increase in strength. The pathways of activation of these neurons and their functional role are discussed.A. A. Zhdanov Leningrad State University. Translated from Neirofiziologiya, Vol. 1, No. 1, pp. 32–40, January–February, 1972. |
