Loudness perception can be studied based on the assumption that sounds of equal loudness elicit equal reaction time (RT; or “response latency”). We measured the underwater RTs of a harbor porpoise to narrowband frequency-modulated sounds and constructed six equal-latency contours. The contours paralleled the audiogram at low sensation levels (high RTs). At high-sensation levels, contours flattened between 0.5 and 31.5 kHz but dropped substantially (RTs shortened) beyond those frequencies. This study suggests that equal-latency-based frequency weighting can emulate noise perception in porpoises for low and middle frequencies but that the RT-loudness correlation is relatively weak for very high frequencies.
CITATION STYLE
Wensveen, P. J., Huijser, L. A. E., Hoek, L., & Kastelein, R. A. (2016). Underwater equal-latency contours of a harbor porpoise (Phocoena phocoena) for tonal signals between 0.5 and 125 kHz. In Advances in Experimental Medicine and Biology (Vol. 875, pp. 1223–1228). Springer New York LLC. https://doi.org/10.1007/978-1-4939-2981-8_153
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