[Characteristics of the response area of mouse inferior colliculus neurons within the critical band].
The inferior colliculus neurons which characteristic frequencies are in the range of 17-25 kHz, corresponding in mice to the width of psychophysical critical band with central frequency of 20 kHz, revealed all types of rate/level functions traditional to the auditory system neurons: monotonic, plateau and non-monotonic. Simultaneous presentation of two tones provide the following effects in the neuron response area: threshold sensitivity shift to high intensities; the reduction of intensity range within the neuron frequency response area; the increase of neurons selectivity to the stimulus frequency parameters, cause not only restriction of response exhibitory area, but threshold decrease on the CF stimulus. The finding suggest a coexistence of two inhibitory systems, one of which provides the stability of auditory system's frequency selectivity in the wide intensity range and the other regulating perception of signal intensity within neuron frequency area.
Malinina
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I. M. Sechenov Institute of Evolutionary Physiology and Biochemistry of the Russian Acad. Sci., St. Petersburg, Russia.
Vartanian
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D000161:Acoustic Stimulation; D000818:Animals; D001307:Auditory Perception / Q000502:physiology*; D001309:Auditory Threshold / Q000502:physiology; D005260:Female; D007245:Inferior Colliculi / Q000166:cytology / Q000502:physiology*; D051379:Mice; D009474:Neurons / Q000502:physiology*