Kastelein, Ronald A. and Helder-Hoek, Lean and Defillet, Linde N. and Terhune, John M. and Beutelmann, Rainer and Klump, Georg M. (2023) Masking release at 4 and 32 kHz in harbor seals associated with sinusoidal amplitude-modulated masking noise. The journal of the Acoustical Society of America, 154 (1). pp. 81-94. ISSN 0001-4966 - 1520-8524

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Official URL: http://dx.doi.org/10.1121/10.0019631


Masking can reduce the efficiency of communication and prey and predator detection. Most underwater sounds fluctuate in amplitude, which may influence the amount of masking experienced by marine mammals. The hearing thresholds of two harbor seals for tonal sweeps (centered at 4 and 32 kHz) masked by sinusoidal amplitude modulated (SAM) Gaussian one-third octave noise bands centered around the narrow-band test sweep frequencies, were studied with a psychoacoustic technique. Masking was assessed in relation to signal duration, (500, 1000, and 2000 ms) and masker level, at eight amplitude modulation rates (1–90 Hz). Masking release (MR) due to SAM compared thresholds in modulated and unmodulated maskers. Unmodulated maskers resulted in critical ratios of 21 dB at 4 kHz and 31 dB at 32 kHz. Masked thresholds were similarly affected by SAM rate with the lowest thresholds and the largest MR being observed for SAM rates of 1 and 2 Hz at higher masker levels. MR was higher for 32-kHz maskers than for 4-kHz maskers. Increasing signal duration from 500 ms to 2000 ms had minimal effect on MR. The results are discussed with respect to MR resulting from envelope variation and the impact of noise in the environment on target signal detection.

Item Type: Article
Uncontrolled Keywords: Underwater acoustics, Auditory perception, Bioacoustics of mammals, Hydrophone, Acoustic noise, Frequency modulation, Amplitude modulation, Anthropogenic, Signal processing, Signal-to-noise ratio
Subjects: Science and mathematics > Life sciences, biology
Science and mathematics > Animals (zoology)
Divisions: Faculty of Medicine and Health Sciences > Department of Neuro Sciences
Date Deposited: 19 Jan 2024 10:37
Last Modified: 19 Jan 2024 10:37
URI: https://oops.uni-oldenburg.de/id/eprint/6068
URN: urn:nbn:de:gbv:715-oops-61499
DOI: 10.1121/10.0019631

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