Auditory temporal resolution and evoked responses to pulsed sounds for the Yangtze finless porpoises (<Emphasis Type="Italic">Neophocaena phocaenoides asiaeorientalis</Emphasis>) |
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Authors: | T Aran Mooney Songhai Li Darlene R Ketten Kexiong Wang Ding Wang |
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Institution: | (1) Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA 025423, USA;(2) Key Laboratory of Aquatic Biodiversity and Conservation of the Chinese Academy of Sciences Institute of Hydrobiology, The Chinese Academy of Sciences, Wuhan, 430072, People’s Republic of China;(3) Marine Mammal Research Program, Hawaii Institute of Marine Biology, University of Hawaii, P.O. Box 1106, Kailua, HI 96734, USA;(4) Harvard Medical School, Boston, MA 02114, USA |
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Abstract: | Temporal cues are important for some forms of auditory processing, such as echolocation. Among odontocetes (toothed whales,
dolphins, and porpoises), it has been suggested that porpoises may have temporal processing abilities which differ from other
odontocetes because of their relatively narrow auditory filters and longer duration echolocation signals. This study examined
auditory temporal resolution in two Yangtze finless porpoises (Neophocaena phocaenoides asiaeorientalis) using auditory evoked potentials (AEPs) to measure: (a) rate following responses and modulation rate transfer function for
100 kHz centered pulse sounds and (b) hearing thresholds and response amplitudes generated by individual pulses of different
durations. The animals followed pulses well at modulation rates up to 1,250 Hz, after which response amplitudes declined until
extinguished beyond 2,500 Hz. The subjects had significantly better hearing thresholds for longer, narrower-band pulses similar
to porpoise echolocation signals compared to brief, broadband sounds resembling dolphin clicks. Results indicate that the
Yangtze finless porpoise follows individual acoustic signals at rates similar to other odontocetes tested. Relatively good
sensitivity for longer duration, narrow-band signals suggests that finless porpoise hearing is well suited to detect their
unique echolocation signals. |
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