猫蝸牛神経核ニューロンによる2音刺激の時間的効果の研究

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概要

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• Poststimulatory effects of two-tone stimulus were studied in single units of the cochlear nucleus of anesthetized cats. Experimental animals were anesthetized with intraperitoneal injection of Nenbutatl and the muscles were relaxed with Flexedil and artificial respiration was used.After opening the posterior fossa of the skull, the cerebellum was removed and the cochlear nucleus was exposed. Unitary responses were obtained with a tungstein microelectrode and frequency tuning curves, spike rates and two-tone responses were measured. Two-tone stimulus was consisted with a masking tone and a test tone. The frequency of the test tone was characteristic frequency of the neuron and its intensity was above threshold at 10 to 20dB. The frequency of the masking tone was somewhat differed from the characteristic frequency of the neuron by 1/8-1/2 octaves.The frequency tuning curve of the neurons of the cochlear nucleus were classified into 4 types; primary-like, narrow, symmetrical broad and atypical. The response to the test tonewas reduced by the masking tone, and the size of the decrement depended on various stimulus conditions. When the masking tone intensity was increased and the frequency difference to the test tone was decreased, the driven response was inversely proportional to the masking tone. However, in some neurons the results were differed. The decrement was decreased as the silent interval between the masking tone and the test tone was increased. The recovery patterns were divided into 4 types; 1, exponentially; the decrease of the spike discharges to the test tone was monotonic and its time constant was found to be 40-300msec, 2, dip formed; the decreasewas most remarkable at 10 or 20msec of the interval, 3, slow recovery; the decrease was remarkable beyound 200msec of the interval, 4, others; unaffected response and/or occationally other types of responses mentioned before. In some neurons it was found that the masking tone made the intensity function of the neuron sharper.According to our results, the following conclusion was made: The neurons of the cochlear nucleus had a higher grade of the function of sound discremination than the auditory nerve, as shown by its anatomical characteristics of the cochlear nucleus.

• 社団法人 日本耳鼻咽喉科学会の論文

著者

• 丹羽 英人

  名古屋大学

• 棚橋 汀路

  名古屋大学医学部附属病院分院耳鼻咽喉科

• 松村 康一

  名古屋大学医学部付属病院分院耳鼻咽喉科

• 岩田 洋

  名古屋大学医学部付属病院分院耳鼻咽喉科

• 棚橋 汀路

  名古屋大学医学部耳鼻咽喉科教室

• 棚橋 汀路

  名古屋大学医学部付属病院分院耳鼻咽喉科

• 丹羽 英人

  名古屋大学医学部付属病院分院耳鼻咽喉科

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