Critical ratio and critical bandwidth for the Atlantic bottlenose dolphin

Publisher Website
Google Scholar
Abstract
Masked underwater pure‐tone thresholds were obtained for an Atlantic bottlenose dolphin using an up–down staircase method of stimulus presentation and a go/no‐go response paradigm. Two types of masking noise were used: a broadband noise and variable bandwidth noise with sharp low‐ and high‐frequency cutoffs. The animal’s critical ratio was measured at frequencies of 30, 60, 90, 100, 110, 120, and 140 kHz. For frequencies of 100 kHz and below, the critical ratios were similar to those measured by Johnson [J. Acoust. Soc. Am. 4 4, 965–967 (1968)]. The dolphin’s critical bandwidth at frequencies of 30, 60, and 120 kHz was measured with the variable bandwidth noise. The critical bandwidth was 10.4 dB (11 times) wider than the critical ratio at 30 kHz, 8.2 dB (6.6 times) wider at 60 kHz, and 3.5 dB (2.2 times) wider at 120 kHz.

This publication has 0 references indexed in Scilit: