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Manatee sound localization: Performance abilities, interaural level cues, and usage of auditory evoked potential techniques to determine sound conduction pathways
| Content Provider | Semantic Scholar |
|---|---|
| Author | Colbert, Debborah E. |
| Copyright Year | 2008 |
| Abstract | An eight-choice discrimination paradigm was used to determine the sound localization abilities of two Florida manatees (Trichechus manatus latirostris) within a 360 array of speakers positioned 45 apart. Five conditions were tested including a 3,000 ms and 200 ms, 95 dB, 0.2-24 kHz broadband signal, a 3,000 ms, 80 dB, 18-24 kHz broadband signal that was restricted to frequencies with wavelengths shorter than a manatee’s interaural time distances, a 3000 ms, 110 dB, 0.2-1.5 kHz broadband signal that was limited to frequencies with wavelengths longer than their interaural time distances, and a 200 ms, 101 dB, 4 kHz tonal stimulus that’s an approximate midpoint of the fundamental frequency range of manatee vocalizations. A sixth condition attenuated the spectrum level of the 3,000 ms, 95 dB, 0.2-24 kHz signal in 3 dB increments until accuracy reached 75%. Both subjects performed well above the 12.5% chance level for all broadband frequencies tested. They also were able to localize over a fairly large sound level range with Hugh’s accuracy at 48% and Buffett’s at 56% when the signal was presented at 80 dB re 1 μPa. Accuracy deteriorated to 14 % for Hugh and 20 % for Buffett when the 4 kHz, 200 ms, 101 dB re 1 μPa signal was tested. Errors were primarily located at the |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://scholarcommons.usf.edu/cgi/viewcontent.cgi?article=1182&context=etd&httpsredir=1&referer= |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
