[Frequency characteristics of central auditory neurons following a decrease in the number of periods of excitatory pure tones].
In anesthetized rats, frequency-threshold curves of the inferior colliculus neurons to signals with various number of cycles in a pure tone burst (n=1;10;f/1000X50), were estimated. A great majority of neurons were characterized by pronounced frequency selectivity even to signals containing one cycle. Response thresholds mainly depended on the tone frequency; the maximal threshold sensitivity was obtained at the same frequency when tested with 1 or 10/sec sine wave and 50 msec duration tone. Sharpness of the frequency-threshold curve depends both on duration of signal and discharge pattern of the neuron: when the signal duration decreases sharpening of the frequency-threshold is observed in neurons with initial response, while flattening of the frequency-threshold curve is observed in neurons with sustained response.
D000818:Animals; D001307:Auditory Perception / Q000502:physiology*; D001309:Auditory Threshold / Q000502:physiology; D001931:Brain Mapping; D007245:Inferior Colliculi / Q000502:physiology*; D051381:Rats; D013997:Time Factors
Chastotnye kharakteristiki tsentral'nykh slukhovykh neĭronov pri umen'shenii chisla periodov vozdeĭstvuiushchikh chistykh tonov