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Travelling waves are the physical basis of frequency discrimination in many vertebrate and invertebrate taxa, including mammals, birds, and some insects. In bushcrickets (Tettigoniidae), the  crista acustica  is the hearing organ that has been shown to use sound-induced travelling waves. Up to now, data on mechanical characteristics of sound-induced travelling waves were only available along the longitudinal (proximal-distal) direction. In this study, we use laser Doppler vibrometry to investigate  in-vivo  radial (anterior-posterior) features of travelling waves in the tropical bushcricket  Mecopoda elongata . Our results demonstrate that the maximum of sound-induced travelling wave amplitude response is always shifted towards the anterior part of the  crista acustica . This lateralization of the travelling wave response induces a tilt in the motion of the  crista acustica,  which presumably optimizes sensory transduction by exerting a shear motion on the sensory cilia in this hearing organ.

Lateralization of Travelling Wave Response in the Hearing Organ of Bushcrickets