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  • Title: A re-evaluation of auditory filter shape in delphinid odontocetes: evidence of constant-bandwidth filters.
    Author: Lemonds DW, Kloepper LN, Nachtigall PE, Au WW, Vlachos SA, Branstetter BK.
    Journal: J Acoust Soc Am; 2011 Nov; 130(5):3107-14. PubMed ID: 22087939.
    Abstract:
    The auditory filter shape of delphinid odontocetes was previously considered to be typically mammalian constant-quality in which filter bandwidths increase proportionally with frequency. Recent studies with porpoises demonstrate constant-bandwidth portions of the auditory filter. The critical ratios for a bottlenose dolphin were measured between 40 and 120  kHz by behaviorally determining the subject's ability to detect pure tones in the presence of white noise. Critical ratios as a function of frequency were constant, indicating the auditory filter acts as a constant-bandwidth system in this frequency range. Re-analysis of past studies supports these findings, and suggests the delphinid auditory system is best characterized as a constant-Q system below 40  kHz and a constant-bandwidth-like system between 40  kHz and 120  kHz before returning to a constant Q pattern at the highest frequencies.
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