[Top] [All Lists]

Bioacoustics paper in Current Biology

To: <>, <>
Subject: Bioacoustics paper in Current Biology
From: Natasha Mhatre <>
Date: Mon, 30 Sep 2013 09:33:59 +0200
Dear all,

We just published a paper on a cochlear amplifier like mechanism in the tympanal auditory system of a cricket. The paper is open access. Apologies for cross posting.

A Tympanal Insect Ear Exploits a Critical Oscillator for Active Amplification and Tuning
Natasha Mhatre & Daniel Robert

  • The tympanal ears of a tree cricket use active amplification
  • Active amplification and not passive resonance determines tuning to song frequency
  • Active amplification and tuning have an “on” and an “off” state
  • Crickets are the phylogenetically oldest insects with active auditory amplification

A dominant theme of acoustic communication is the partitioning of acoustic space into exclusive, species-specific niches to enable efficient information transfer. In insects, acoustic niche partitioning is achieved through auditory frequency filtering, brought about by the mechanical properties of their ears [1]. The tuning of the antennal ears of mosquitoes [2] and flies [3], however, arises from active amplification, a process similar to that at work in the mammalian cochlea [4]. Yet, the presence of active amplification in the other type of insect ears—tympanal ears—has remained uncertain [5]. Here we demonstrate the presence of active amplification and adaptive tuning in the tympanal ear of a phylogenetically basal insect, a tree cricket. We also show that the tree cricket exploits critical oscillator-like mechanics, enabling high auditory sensitivity and tuning to conspecific songs. These findings imply that sophisticated auditory mechanisms may have appeared even earlier in the evolution of hearing and acoustic communication than currently appreciated. Our findings also raise the possibility that frequency discrimination and directional hearing in tympanal systems may rely on physiological nonlinearities, in addition to mechanical properties, effectively lifting some of the physical constraints placed on insects by their small size [6] and prompting an extensive reexamination of invertebrate audition

Best wishes,
<Prev in Thread] Current Thread [Next in Thread>
  • Bioacoustics paper in Current Biology, Natasha Mhatre <=

The University of NSW School of Computer and Engineering takes no responsibility for the contents of this archive. It is purely a compilation of material sent by many people to the Bioacoustics-L mailing list. It has not been checked for accuracy nor its content verified in any way. If you wish to get material removed from the archive or have other queries about the archive e-mail Andrew Taylor at this address: andrewt@cse.unsw.EDU.AU