Tonal response patterns of primary auditory cortex neurons in alert cats

摘要: The firing rates of primary auditory cortex (A1) neurons are known to be modulated only at the onset, offset, and change a tonal stimulus in anesthetized animals. response pattern has been rarely investigated alert We time-course A1 neuron responses steady cats. found four types based on statistical evaluation time course rate. tonic cells (38 cells) showed significant (P<0.05) increase throughout period after relatively long latency (mean, 25.3 ms) with little tendency adaptation. phasic-tonic (22 medium (19.8 adaptation less than half maximum excitation level. Phasic (15 responded, short (10.2 ms), onset offset stimuli. unresponsive (26 did not show during findings suggest that there is functional difference between each type cells: encode information static signals their rates; cells, changing signal period; phasic rapid offset.