... such as different muscle tensions. Summary: Noctuid moth wing position affects neural hearing sensitivity. No significant differences in eardrum movement occur; therefore, differences are hypothesized to be due to internal factors such as muscle tension. Neurophysiology Tympanum Biomechanics Insect...

... by The Company of Biologists Ltd 2013 auditory tympanum katydid tettigoniid Orthoptera laser vibrometry trachea pseudophylline Onomarchus uninotatus Tettigoniid (bushcricket) acoustic communication is under several different evolutionary selection pressures. To improve mate attraction...

... physiological mechanisms, thus remains unknown. * Author for correspondence ( hannah.moir@eee.strath.ac.uk ) 5 7 2011 © 2011. 2011 bioacoustics hearing tympanum locust distortion-product otoacoustic emissions laser Doppler vibrometry Insect hearing organs, despite...

... 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...

...Jérôme Sueur; James F. C. Windmill; Daniel Robert SUMMARY In cicadas, the tympanum is anatomically intricate and employs complex vibrations as a mechanism for auditory frequency analysis. Using microscanning laser Doppler vibrometry, the tympanal mechanics of Cicada orni can be characterized...

... element of the tympanum that is a link to the receptor cells, undergoes mechanical vibrations reminiscent of a travelling wave. In effect, the frequency for which the maximum deflection amplitude is observed regularly decreases from the apex to the base of the ridge. It is also shown that whilst female...

... tympanum reptile lizard frog bird The middle ears of terrestrial vertebrates come in two different forms. In the pressure receiver ear found in mammals and some birds, the two middle ear cavities are (nearly) acoustically isolated, non-directional pressure receivers ( Wightman and Kistler,1993...

... combines in one structure the functions of sound reception and frequency decomposition. * Author for correspondence (e-mail: james.windmill@bristol.ac.uk ) 5 10 2004 © The Company of Biologists Limited 2005 2005 bioacoustics frequency detection hearing travelling wave tympanum...

... the intertympanal bridge occurs during the mechanical stimulation of only one tympanum, i.e. in the absence of any acoustic input to the system, thus demonstrating the pure mechanical nature of coupling (as opposed to acoustic coupling) via the intertympanal bridge ( Robert et al., 1998 ). It has also been...

.... Neurophysiologically determined thresholds increased by more than 35 dB when drops of water covered the tympanic membranes and were essentially restored to the control level when the water was later removed. At least three other genera of Dynastinae scarabs have similar tympanum-like structures located...

... of the folded tympanum on the auditory threshold of two species of cicadas, Tibicen linnei and Okanagana rimosa . Auditory thresholds of both species increased by about 20 dB when the tympana folded during singing. In T. linnei the increase in threshold affected the whole frequency range, from 1 to 16 kHz...

... of the tympanum without nodal lines, but only at frequencies similar to those previously measured for the air-sac resonance. This experiment provides further supporting evidence for the suggestion that the tympana are acoustically transparent and are the major acoustic apertures of the abdominal air sac ( Young...

... of C. australasiae (mean 113 dB). The male tympanum (ear-drum) is between 3·3 (M. angularis) and 5·5 (C. australasiae) times greater in area than that of the female, which does not sing. The tympana and folded membranes, as well as the sound-generating tymbals, vibrate vigorously during singing; other...