[Effect of amygdalectomy on evoked potentials of the cat sensomotor cortex]

It has been shown that EPs in the sensorimotor cortex of amygdalectomized cats appear in response to almost all burst of tone frequencies ranging from 0.2 to 10.0 khz. No EPs with maximal amplitudes and maximal response probability (observed in intact animals), have been recorded in response to frequencies of 0.8, 1.6 and 2.0 to 3.0 khz. The curves of dependency of EPs amplitude and appearance probability on the tone frequency had not a single statistically significant maximum. Partial ablation of the amygdala complex impairs frequency selectivity of sensosimotor cortical EPs revealed in intact animals. The obtained data suggest that the amygdala complex is an essential element of the system detecting biologically meaningful parameters of the acoustic signal.