Temperature dependence of anuran distortion product otoacoustic emissions

Sebastlaan W. F. Meenderink, Pim Van Dijk*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)

Abstract

To study the possible involvement of energy dependent mechanisms in the transduction of sound within the anuran ear, distortion product otoacoustic emissions (DPOAEs) were recorded in the northern leopard frog over a range of body temperatures. The effect of body temperature depended on the stimulus levels used and on the hearing organ under investigation. Low-level DPOAEs from the amphibian papilla (AP) were reversibly depressed for decreased body temperatures. Apparently, DPOAE generation in the AP depends on metabolic rate, indicating the involvement of active processes in the transduction of sound. In contrast, in the other hearing organ, the basilar papilla (BP), the effects of body temperature on DPOAEs were less pronounced, irrespective of the stimulus levels used. Apparently, metabolic rate is less influencing DPOAE generation. We interpret these results as evidence that no amplifier is involved in sound transduction in the BP. The passive functioning of the anuran BP would place this hearing organ in a unique position within tetrapod hearing, but may actually be beneficial to ectothermic species because it will provide the animal with a consistent spectral window, regardless of ambient or body temperature.

Original languageEnglish
Pages (from-to)246-252
Number of pages7
JournalJournal of the Association for Research in Otolaryngology
Volume7
Issue number3
DOIs
Publication statusPublished - Sep-2006

Keywords

  • distortion product otoacoustic emissions
  • anuran
  • temperature dependence
  • passive hearing
  • COCHLEAR MICROMECHANICAL PROPERTIES
  • AUDITORY-NERVE
  • BASILAR PAPILLA
  • FROG
  • EAR
  • HUMANS

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