The next step in cicada audition: measuring pico-mechanics in the cicada's ear

James F.C. Windmill, J. Sueur, Daniel Robert

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Female cicadas use sound when they select a mate from a chorus of singing males. The cicada has a tympanal ear; and the tympanal membrane, and constituent tympanal ridge, act as both acousto-mechanical transducers and frequency filters. The tympanal ridge is physically connected to a large number of mechanoreceptor neurons via a cuticular extension known as the tympanal apodeme. Using microscanning laser Doppler vibrometry, we measured for the first time the in vivo vibrations of the apodeme of female Cicadatra atra in response to the motion of the tympanum driven by sound. These measurements reveal that the nanoscale motion of the tympanal membrane is over a magnitude greater than that of the apodeme. Furthermore, the apodeme acts as an additional mechanical frequency filter, enhancing that of the tympanal ridge, narrowing the frequency band of vibration at the mechanoreceptor neurons to that of the male calling song. This study enhances our understanding of the mechanical link between the external ear of the cicada and its sensory cells.
Original languageEnglish
Pages (from-to)4079-4083
Number of pages4
JournalJournal of Experimental Biology
Volume212
Issue number24
DOIs
Publication statusPublished - 15 Dec 2009

Keywords

  • biomechanics
  • hearing
  • tympanum
  • apodeme
  • frequency discrimination
  • cicada

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