Temporal resolution of the Florida manatee (Trichechus manatus latirostris) auditory system

Auditory evoked potential (AEP) measurements of two Florida manatees (Trichechus manatus latirostris) were measured in response to amplitude modulated tones. The AEP measurements showed weak responses to test stimuli from 4 kHz to 40 kHz. The manatee modulation rate transfer function (MRTF) is maxim...

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Bibliographic Details
Published in:Journal of Comparative Physiology 2005-10, Vol.191 (10), p.903-908
Main Authors: Mann, David A, Colbert, Debborah E, Gaspard, Joseph C, Casper, Brandon M, Cook, Mandy L. H, Reep, Roger L, Bauer, Gordon B
Format: Article
Language:English
Subjects:
Acoustic Stimulation
Animals
Auditory Threshold - physiology
brain
Cetacea
chinchillas
Conditioning, Operant
dolphins
electrodes
Electrodes, Implanted
evoked potentials
Evoked Potentials, Auditory - physiology
Food
gerbils
hearing
Hearing - physiology
humans
Male
Marine
Reward
Rodentia
Time Factors
Trichechidae
Trichechus - physiology
Trichechus manatus latirostris
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Summary:Auditory evoked potential (AEP) measurements of two Florida manatees (Trichechus manatus latirostris) were measured in response to amplitude modulated tones. The AEP measurements showed weak responses to test stimuli from 4 kHz to 40 kHz. The manatee modulation rate transfer function (MRTF) is maximally sensitive to 150 and 600 Hz amplitude modulation (AM) rates. The 600 Hz AM rate is midway between the AM sensitivities of terrestrial mammals (chinchillas, gerbils, and humans) (80-150 Hz) and dolphins (1,000-1,200 Hz). Audiograms estimated from the input-output functions of the EPs greatly underestimate behavioral hearing thresholds measured in two other manatees. This underestimation is probably due to the electrodes being located several centimeters from the brain.
ISSN:0340-7594
1432-1351
DOI:10.1007/s00359-005-0016-2