Two-tone stimuli were used with harmonic relation between their components (F1-F6). At equal intensities of the harmonics, one of which was the neuron best frequency and the other did not, evoke any impulse response, the neuron response as compared to that at the best frequency tone alone, was decreased in 50% of all cases, facilitated in 19% and not changed in 31% of cases. Harmonics nearest to the best frequency tone were most effective in the decreasing or increasing neuronal activity. With diminution of the intensity of the best frequency tone, F4 by 10-20 dB decreasing effects were less pronounced at all the side harmonics except F5, whereas facilitatory effects rose greatly at the lower harmonics F1-F3. Neuronal response, facilitatory or inhibitory, to a two-tone stimulus was also connected with the effects of the side harmonic on the neuron spontaneous activity and the neuron response value to F4. Statistical character of the relations observed seems to be due to the variety of interfering factors.
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