Biomechanics of hearing in katydids

Montealegre-Z, Fernando and Robert, Daniel (2015) Biomechanics of hearing in katydids. Journal of Comparative Physiology A, 201 (1). pp. 5-18. ISSN 0340-7594

JCPA-D-14-00131-2.pdf - Whole Document

Item Type:Article
Item Status:Live Archive


Animals have evolved a vast diversity of mechanisms to detect sounds. Auditory
organs are used to detect intraspecific communicative signals and environmental
sounds relevant to survival. To hear, terrestrial animals must convert the acoustic
energy contained in the airborne sound pressure waves into neural signals. In
mammals, spectral quality is assessed by the decomposition of incoming sound waves
into elementary frequency components using a sophisticated cochlear system. Some
neotropical insects like katydids (bushcrickets) have evolved biophysical mechanisms
for auditory processing that are remarkably equivalent to those of mammals. Located
on their front legs, katydid ears are small, yet are capable of performing several of the
tasks usually associated with mammalian hearing. These tasks include air-to-liquid
impedance conversion, signal amplification, and frequency analysis. Impedance
conversion is achieved by a lever system, a mechanism functionally analogous to the
mammalian middle ear ossicles, yet morphologically distinct. In katydids, the exact
mechanisms supporting frequency analysis seem diverse, yet are seen to result in
dispersive wave propagation phenomenologically similar to that of cochlear systems.
Phylogenetically unrelated, katydids and tetrapods have evolved remarkably different
structural solutions to common biophysical problems. Here, we discuss the biophysics
of hearing in katydids and the variations observed across different species.

Keywords:Hearing, Katydid, bmjgoldcheck, NotOAChecked
Subjects:D Veterinary Sciences, Agriculture and related subjects > D300 Animal Science
Divisions:College of Science > School of Life Sciences
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ID Code:16270
Deposited On:12 Dec 2014 13:08

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