複合音刺激による家兎下丘ニューロンの応答

抄録

The responses of auditory neurons in the inferior colliculus of the rabbit were obtained in response to mixed tone, which consisted of 3 tones. The 1st group; f₁ was 300Hz, f₂ was 1000Hz and f₃ was 2300Hz. The 2nd group; f₄ was 800Hz, f₅ was 1100Hz and f₆ was 2400Hz. The responses to pure tone stimulus and mixed tone stimulus were compared. The results showed that temporal distribution of spike discharges of the inferior colliculus neuron to mixed tone stimulus were different from simple summation of pure tone responses. The changes of the response pattern (PST histgram) were obtained in some specific neurons and the simple changes of spike rate were observed in some neurons. Accoding to the results we concluded that the change of the response could be based on the neural mechanism of the auditory system in the brainstem and were different from the audiotory adaptation and/or two-tone suppuression mechanism.