Abstract
The auditory system is often modeled by a bank of band-pass filters. There are two different estimates of the bandwidth of the auditory filters, called the critical ratio (CR) and the critical bandwidth (CB), based on measuring detection thresholds of a pure tone in continuous broadband noise (Fletcher 1940). In humans, the CRs are ∼2.5 times smaller than the CBs. In the bottlenose dolphin (Tursiops truncates), the relationship between the CR and CB is different than that in humans. Au and Moore (1990), using a behavioral-response paradigm and variable bandwidth noise, found that in Tursiops truncates, the CB was 11 times wider than the CR at 30 kHz, 8.2 times wider at 60 kHz, and 2.2 times wider at 120 kHz. The CBs at these frequencies were found to be 17, 25, and 45 kHz, respectively. Even the CR measured at 100 and 120 kHz was as large as that around 20 kHz. Lemonds et al. (2000), in behavioral experiments, estimated the auditory filter bandwidth in Tursiops truncates using notched noise. Equivalent rectangular bandwidth (ERB) of the suggested auditory roex(p,r) filters was found to range from 4.4 kHz at 40 kHz to 16 kHz at 100 kHz.
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Zaslavski, G. (2012). Frequency Selectivity in the Bottlenose Dolphin Auditory System. In: Popper, A.N., Hawkins, A. (eds) The Effects of Noise on Aquatic Life. Advances in Experimental Medicine and Biology, vol 730. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-7311-5_8
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