On Peripheral Auditory Adaptation. II. Comparison of Electrically and Acoustically Evoked Action Potentials in the Guinea Pig

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Abstract:

The compound action potential evoked by tone bursts or clicks shows a stimulus-rate dependence called adaptation. The localization of this adaptation is thought to be central to the top of the hair cells, i.e., in the hair-cell neuron synapse and/or the nerve mechanisms. To study this localization further, we compared the behaviour of acoustically and electrically evoked compound action potentials. The results imply that the contribution of a single nerve fibre to the compound action potential is constant under varying stimulus conditions. Since the nerve mechanisms cannot be responsible for the adaptation behaviour of the acoustically evoked AP, it is concluded that the localization of adaptation resides in the hair-cell neuron synapse.

Zusammenfassung

Das durch Tonbursts oder Clicks ausgelöste Summenaktionspotential weist eine Abhängigkeit von der Wiederholrate des Reizes auf, die als Adaptation bezeichnet wird. Diese Adaptation wird Strukturen zugeordnet, die zentral in Bezug zu den Haarzellen sind, d.h. den Synapsen zwischen Haarzelle und Neuron oder dem Neuron selbst. Um diese Zuordnung weiter zu untersuchen, wurde das Verhalten von elektrisch und akustisch evozierten Summenaktionspotentialen verglichen. Die Ergebnisse implizieren, daß der Beitrag einer einzelnen Nervenfaser unter variablen Reizbedingungen konstant ist. Da der Nervenmechanismus nicht für das Adaptationsverhalten verantwortlich sein kann, wird die Adaptation der Synapse zwischen Haarzelle und Neuron zugeschrieben.

Sommaire

Le potentiel d'action composite évoqué par sons brefs ou par clicks varie en fonction du rythme de répétition de la stimulation, c'est ce qu'on appelle l'adaptation. On pense que l'origine de ce phénomène se situe au delà de la membrane réticulaire, c'est-à-dire au niveau de la synapse cellule ciliée — neurone, ou même au niveau des mécanismes nerveux. Pour mieux définir cette localisation, on a comparé les caractéristiques du potentiel d'action composite évoqué par voie acoustique et par voie électrique. Les résultats ont montré que la contribution d'une fibre nerveuse unique au potentiel d'action global reste constante lorsque varient les stimulations. On en conclut que, puisque les mécanismes nerveux ne peuvent être responsables de l'adaptation du potentiel d'action évoqué acoustiquement, le phénomène d'adaptation devait se localiser au niveau de la synapse cellule ciliée — neurone.

Document Type: Research Article

Publication date: May 1, 1980

More about this publication?
  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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