The modulation rate transfer function of a harbour porpoise (Phocoena phocoena).
J Comp Physiol A Neuroethol Sens Neural Behav Physiol
; 199(2): 115-26, 2013 Feb.
Article
em En
| MEDLINE
| ID: mdl-23149551
ABSTRACT
During echolocation, toothed whales produce ultrasonic clicks at extremely rapid rates and listen for the returning echoes. The auditory brainstem response (ABR) duration was evaluated in terms of latency between single peaks 5.5 ms (from peak I to VII), 3.4 ms (I-VI), and 1.4 ms (II-IV). In comparison to the killer whale and the bottlenose dolphin, the ABR of the harbour porpoise has shorter intervals between the peaks and consequently a shorter ABR duration. This indicates that the ABR duration and peak latencies are possibly related to the relative size of the auditory structures of the central nervous system and thus to the animal's size. The ABR to a sinusoidal amplitude modulated stimulus at 125 kHz (sensitivity threshold 63 dB re 1 µPa rms) was evaluated to determine the modulation rate transfer function of a harbour porpoise. The ABR showed distinct envelope following responses up to a modulation rate of 1,900 Hz. The corresponding calculated equivalent rectangular duration of 263 µs indicates a good temporal resolution in the harbour porpoise auditory system similar to the one for the bottlenose dolphin. The results explain how the harbour porpoise can follow clicks and echoes during echolocation with very short inter click intervals.
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Base de dados:
MEDLINE
Assunto principal:
Tempo de Reação
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Tronco Encefálico
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Potenciais Evocados Auditivos do Tronco Encefálico
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Ecolocação
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Phocoena
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Modelos Neurológicos
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Rede Nervosa
Limite:
Animals
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article