2014
DOI: 10.1007/s00359-014-0976-1
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Biomechanics of hearing in katydids

Abstract: Abstract: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 l… Show more

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Cited by 39 publications
(54 citation statements)
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“…When the fold was removed, untuned directionality resulted. This finding would support the hypothesis that cuticular folds and tympanal organ slits enhance directional hearing (Autrum, 1963;Bailey and Stephen, 1978;Stephen and Bailey, 1982;Montealegre-Z and Robert, 2015). Therefore, to determine peripheral directionality in this species, we used the extracellular recordings of neuronal activity of the auditory interneuron 1 (AN1) as indicators.…”
Section: Manipulation Of the Acoustic Tracheal Systemsupporting
confidence: 58%
“…When the fold was removed, untuned directionality resulted. This finding would support the hypothesis that cuticular folds and tympanal organ slits enhance directional hearing (Autrum, 1963;Bailey and Stephen, 1978;Stephen and Bailey, 1982;Montealegre-Z and Robert, 2015). Therefore, to determine peripheral directionality in this species, we used the extracellular recordings of neuronal activity of the auditory interneuron 1 (AN1) as indicators.…”
Section: Manipulation Of the Acoustic Tracheal Systemsupporting
confidence: 58%
“…Two possible functions of the pitted surface or, more specifically, the cuticular cap covering the pit could be postulated: 1) the cap could protect the extremely thin and, therefore, delicate underlying ATM from mechanical damage and 2) it could function as a sound-guiding structure to enhance directional hearing properties, as previously investigated in different katydid species belonging to the family Tettigoniidae. These species possess similar ear morphology, with the ear consisting of cuticular folds surrounding the tympana 3436 .…”
Section: Discussionmentioning
confidence: 99%
“…2), both pressure components originate from the same side. Sound travels at a lower speed inside the trachea and will, therefore, reach the inner tympanum a few micro-seconds later than it reaches the external tympanum, providing the basis for the observed pressuredifference mechanism in the ear (Autrum 1940;Michelsen et al 1994a;Montealegre-Z and Robert 2015). However, a morphological characteristic of many species is a hornshaped tracheal tube or acoustic bullae, which acts like an exponential horn to amplify sound to the internal surface of the tympana by 10-30 dB (Lewis 1974;Hill and Oldfield 1981;Heinrich et al 1993;Hoffmann and Jatho 1995).…”
Section: The Anatomical Basis For Ear Couplingmentioning
confidence: 98%