Effect of two levels of masking noise on the hearing threshold of a harbor porpoise (phocoena phocoena) for a 4.0 kHz signal

Ronald A. Kastelein*, Paul J. Wensveen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

The 50% detection hearing thresholds of a harbor porpoise for a 4.0 kHz narrow-band FM signal, presented at the background noise level in a pool and with two masking noise levels, were measured using a go/no-go response paradigm and an up-down staircase psychometric method. The masker consisted of a 1/6-octave noise band with a center frequency of 4.25 kHz. Its amplitude declined at 24 dB/octave on both sides of the spectral plateau. The absolute hearing threshold of the porpoise, found previously, was confirmed. The animal's auditory system responded in a linear fashion to the increase in masking noise. Since the narrow-band noise was off-center of the test frequency, the critical ratio of a harbor porpoise for 4.0 kHz tonal signals in white noise can at present only be estimated to be between 18 and 21 dB re: 1 μPa.

Original languageEnglish
Pages (from-to)420-425
Number of pages6
JournalAquatic Mammals
Volume34
Issue number4
DOIs
Publication statusPublished - 2008

Keywords

  • Anthropogenic noise
  • Critical ratio
  • Harbor porpoise
  • Hearing
  • Masking
  • Odontocetes
  • Phocoena phocoena

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