High-frequency auditory filter shape for the Atlantic bottlenose dolphin
| Autor: | Paul E. Nachtigall, Stephanie Vlachos, David W. Lemonds, Whitlow W. L. Au |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Acoustics and Ultrasonics
Bioacoustics Acoustics Transducers Discrimination Psychological Arts and Humanities (miscellaneous) Animals Pitch Perception Staircase method Physics biology Pure tone Bandwidth (signal processing) Auditory Threshold Bottlenose dolphin biology.organism_classification Bottle-Nosed Dolphin Noise Transducer Acoustic Stimulation Tone Frequency Auditory Perception Audiometry Pure-Tone Female Perceptual Masking Psychoacoustics |
| Zdroj: | The Journal of the Acoustical Society of America. 132(2) |
| ISSN: | 1520-8524 |
| Popis: | High-frequency auditory filter shapes of an Atlantic bottlenose dolphin (Tursiops truncatus) were measured using a notched noise masking source centered on pure tone signals at frequencies of 40, 60, 80 and 100 kHz. A dolphin was trained to swim into a hoop station facing the noise/signal transducer located at a distance of 2 m. The dolphin's masked threshold was determined using an up-down staircase method as the width of the notched noise was randomly varied from 0, 0.2, 04, 0.6, and 0.8 times the test tone frequency. The masked threshold decreased as the width of the notched increased and less noise fell within the auditory filter associated with the test tone. The auditory filter shapes were approximated by fitting a roex (p,r(r)) function to the masked threshold results. A constant-Q value of 8.4 modeled the results within the frequency range of 40 to 100 kHz relatively well. However, between 60 and 100 kHz, the 3 dB bandwidth was relatively similar between 9.5 and 10 kHz, indicating a constant-bandwidth system in this frequency range The mean equivalent rectangular bandwidth calculated from the filter shape was approximately 16.0%, 17.0%, 13.6% and 11.3% of the tone frequencies of 40, 60, 80, and 100 kHz. |
| Databáze: | OpenAIRE |
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