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; as a result, despite the fact that, they concluded that the recordings were from aberrant cells of the cochlear nucleus mendacity relevant to the glial margin of the VIII nerve (GALAMBOS and DAVIS, 1948). the 1st winning recordmgs from fibres of the cochlear nerve have been made by means of TASAKI (1954) within the guinea pig. those classical yet unavoidably restricted effects have been vastly prolonged through ROSE, GALAMBOS, and HUGHES (1959) within the cat cochlear nucleus and by way of KATSUKI and colleagues (KATSUKI et at. , 1958, 1961, 1962) within the cat and monkey cochlear nerve. might be the main major advancements were the advent of suggestions for specific keep an eye on of the acoustic stimulus and the quantitative research of neuronal reaction styles, significantly by means of 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 various 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. lots of the findings mentioned herein were received on anaesthetized cats. the place comparative information can be found, considerably related effects were acquired in different mammalian species (e. g. guinea pig, monkey, rat). convinced major adjustments were famous in lizards, frogs and fish as will be count on ed from the various morphologies in their organs of listening to (e. g.
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Extra resources for Auditory System: Physiology (CNS)· Behavioral Studies Psychoacoustics
E. Response to Complex Sounds 1. Two-tone Stimuli a) Two-tone Suppression. , 1971). g. GALAMBOS, 1944; GREENWOOD and MARUYAMA, 1965). The phenomenon entails the suppression of activity evoked by one stimulus (tone or noise) by a second tone over a restricted range of frequencies and intensities (Fig. 22). Its properties have been described in detail by SACHS and KIANG (1968), and ARTHUR et al. (1971). The former authors were able to demonstrate suppression in every fibre examined (ct. , 1964). The situation most commonly examined is where the response to a continuous tone (CT) at the CF of a fibre is reduced by a second tone, generally of higher level, within a band of frequencies adjacent to or even slightly overlapping the excitatory response area of the fibre (Fig.
Relative signal level equals dB SPL at CF (see Fig. 30). B-D: three-dimensional arrays of PST histograms ordered in frequency (6-24 kHz) and intensity (10, 20, and 30 dB above threshold respectively as indicated in A). 4 sec) indicated by bar and interrupted lines. Ordinate: firing rate in spikes/sec. Note extensive "sea" of inhibition in D with narrow band "island" of delayed ("build-up") excitation at 21 kHz. (From EVANS and NELSON, 1973a) E. F. EVANS: Cochlear Nerve and Cochlear Nucleus 50 neurones.
__________________________________________________ 1-10 ~ ~ -10 Vl ~ c . (-'J ,JI'\:. • -20- •• Q) .... • .... Q) ... c I- - -. - • • - • • -4o1-____________________________~----------------------__; + 10 L:. 5 Characteristic frequency (kHz) Fig. 26. Difference between noise and tone thresholds for US cochlear fibres from 5 cats, plotted against the CF of each fibre. s. power in 1 Hz bandwidth. ) C: corresponding values computed from FTC of each fibre using expression: 10 loglo ("effective bandwidth" of FTC).