Auditory System: Physiology (CNS) · Behavioral Studies by Moshe Abeles, Göran Bredberg, Robert A. Butler, John H.

By Moshe Abeles, Göran Bredberg, Robert A. Butler, John H. Casseday, John E. Desmedt, Irving T. Diamond, Solomon D. Erulkar, E. F. Evans, Jay M. Goldberg, Moise H. Goldstein, David M. Green, Ivan M. Hunter-Duvar, Lloyd A. Jeffress, William D. Neff, William A

Nerve; for this reason, even though, they concluded that the recordings have been from aberrant cells of the cochlear nucleus mendacity primary to the glial margin of the VIII nerve (GALAMBOS and DAVIS, 1948). the 1st profitable recordmgs from fibres of the cochlear nerve have been made via TASAKI (1954) within the guinea pig. those classical yet unavoidably restricted effects have been tremendously prolonged by means of ROSE, GALAMBOS, and HUGHES (1959) within the cat cochlear nucleus and by means of KATSUKI and associates (KATSUKI et at. , 1958, 1961, 1962) within the cat and monkey cochlear nerve. probably the main major advancements were the advent of suggestions for distinctive keep watch over of the acoustic stimulus and the quantitative research of neuronal reaction styles, particularly through the laboratories of KIANG (e. g. GERSTEIN and KIANG, 1960; KIANG et at. , 1962b, 1965a, 1967) and ROSE (e. g. ROSE et at. , 1967; HIND et at. , 1967). those advancements have made attainable a number of quanti­ tative investigations of the behaviour of consultant numbers of neurons at those degrees of the peripheral auditory procedure less than a large choice of stimulus stipulations. many of the findings mentioned herein were acquired on anaesthetized cats. the place comparative info can be found, considerably comparable effects were bought in different mammalian species (e. g. guinea pig, monkey, rat). convinced major changes were famous in lizards, frogs and fish as will be anticipate­ ed from different morphologies in their organs of listening to (e. g.

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1969). Interaction between two tones can be demonstrated at frequencies inside and outside the frequency response area for the fibre. , 1967). It appears from the data of HIND et al. (1967) that, for frequencies well inside the response area, the levels of a tone required for it to achieve a certain degree of synchronization of the response in the presence of another effective tone are to a large extent governed by its effectiveness in driving the fibre on its own. This is not the case for peripheral frequencies, however, which can be more effective in terms of their dominating of the discharge pattern that their rate response would predict.

It is clear from their data, however, that domination of the discharge rate by a second tone of peripheral frequency can occur even when the discharge pattern has not been dominated by the second tone. 9%, compared with a value of 38 E. F. EVANS: Cochlear Nerve and Cochlear Nucleus 87% for the other tone. ) For comparison, a tone of 3 kHz at 80 dB SPL had no significant effect on discharge rate and gave a synchronization coefficient of 55%. A clear understanding of these interaction phenomena obviously awaits further data.

Presentation time and duration of the two tone bursts indicated under lowest histogram. Repetition rate: lO/sec. Note vigorous response to combination of tones (2/1 - I. 88 kHz) in comparison with negligible response to either tone alone. 5 kHz and I. 69 kHz). Each histogram is synchronized to the fundamental frequency of the harmonically related (4: 3) primary tones. 76 kHz), close to the CF of the fibre. Spontaneous rate: 5 spikes/sec. e. level-normalized) odd-order nonlinearity (GOLDSTEIN and KIANG, 1968; GOLDSTEIN, 1970).

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