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Coding of Amplitude and Frequency Modulated Sounds in the Cochlear Nucleus

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Change in both amplitude and spectrum of a sound is enhanced in the response pattern of single units in the cochlear nucleus. These units typically respond to pure tones within distinct ranges of frequency and intensity. The response areas to tones the frequency of which varies over a large range become narrower at a certain rate of change compared to those obtained for tones with constant or slowly varying frequency. A similar sharpening was obtained in response to band-pass-filtered noise when the center frequency was varied at a certain rate.

Small changes in amplitude of a tone or noise are enhanced in the response pattern in such a way that the modulation of the discharge pattern has a pronounced maximum at a certain modulation frequency (usually between 50 and 200 Hz). Thus these units can be regarded as being tuned to a certain modulation frequency. The dynamic properties of single units in the periphery of the auditory nervous system for coding of complex sound will be discussed.
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Document Type: Research Article

Publication date: December 1, 1974

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  • 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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