Chapter title |
Hearing Mechanisms and Noise Metrics Related to Auditory Masking in Bottlenose Dolphins (Tursiops truncatus).
|
---|---|
Chapter number | 13 |
Book title |
The Effects of Noise on Aquatic Life II
|
Published in |
Advances in experimental medicine and biology, January 2016
|
DOI | 10.1007/978-1-4939-2981-8_13 |
Pubmed ID | |
Book ISBNs |
978-1-4939-2980-1, 978-1-4939-2981-8
|
Authors |
Brian K. Branstetter, Kimberly L. Bakhtiari, Jennifer S. Trickey, James J. Finneran, Branstetter, Brian K., Bakhtiari, Kimberly L., Trickey, Jennifer S., Finneran, James J. |
Editors |
Arthur N. Popper, Anthony Hawkins |
Abstract |
Odontocete cetaceans are acoustic specialists that depend on sound to hunt, forage, navigate, detect predators, and communicate. Auditory masking from natural and anthropogenic sound sources may adversely affect these fitness-related capabilities. The ability to detect a tone in a broad range of natural, anthropogenic, and synthesized noise was tested with bottlenose dolphins using a psychophysical, band-widening procedure. Diverging masking patterns were found for noise bandwidths greater than the width of an auditory filter. Despite different noise types having equal-pressure spectral-density levels (95 dB re 1 μPa(2)/Hz), masked detection threshold differences were as large as 22 dB. Consecutive experiments indicated that noise types with increased levels of amplitude modulation resulted in comodulation masking release due to within-channel and across-channel auditory mechanisms. The degree to which noise types were comodulated (comodulation index) was assessed by calculating the magnitude-squared coherence between the temporal envelope from an auditory filter centered on the signal and temporal envelopes from flanking filters. Statistical models indicate that masked thresholds in a variety of noise types, at a variety of levels, can be explained with metrics related to the comodulation index in addition to the pressure spectral-density level of noise. This study suggests that predicting auditory masking from ocean noise sources depends on both spectral and temporal properties of the noise. |
Mendeley readers
Geographical breakdown
Country | Count | As % |
---|---|---|
Unknown | 8 | 100% |
Demographic breakdown
Readers by professional status | Count | As % |
---|---|---|
Student > Bachelor | 2 | 25% |
Student > Doctoral Student | 1 | 13% |
Other | 1 | 13% |
Student > Ph. D. Student | 1 | 13% |
Student > Master | 1 | 13% |
Other | 0 | 0% |
Unknown | 2 | 25% |
Readers by discipline | Count | As % |
---|---|---|
Environmental Science | 4 | 50% |
Biochemistry, Genetics and Molecular Biology | 1 | 13% |
Agricultural and Biological Sciences | 1 | 13% |
Unknown | 2 | 25% |