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Loudness Adaptation with Modulated Stimuli

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At low sensation levels, loudness adaptation is described as a decrease in loudness judgment over time of a steady, fixed-intensity auditory stimulus, presented monaurally. Similarly, at high sensation levels, loudness enhancement is described as an increase in loudness judgment over time. In the present study, loudness adaptation and loudness enhancement were measured for unmodulated sinusoids, sinusoidally amplitude-modulated sinusoids, and mixed-modulated sinusoids. Each stimulus had a carrier frequency of 500 or 2000 Hz, was presented at 30 or 70 dB SL (sensation level), and had a duration of 302 s. The modulation frequency was 40 Hz. Loudness adaptation percentages were measured using a successive magnitude estimation task. At 70 dB SL, small amounts of loudness enhancement were found at 500 Hz, and no loudness enhancement was found at 2000 Hz, for all modulation types. At 30 dB SL, loudness adaptation was found for all modulation types with more adaptation at 2000 Hz than at 500 Hz. A diff erence in loudness adaptation was found between modulation types, with a more pronounced diff erence at 500 Hz. Mixed-modulated sinusoids showed more adaptation than unmodulated sinusoids, which in turn showed more adaptation than sinusoidally amplitude-modulated sinusoids. The sinusoidally amplitude-modulated stimulus condition did no longer show loudness adaptation at 30 dB SL and 500 Hz. In addition, if loudness adaptation occurred, moderate but significant correlations were found between the participants' absolute thresholds in dB SPL and their loudness adaptation percentages at 30 dB SL.
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Document Type: Research Article

Publication date: November 1, 2015

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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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