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Mathematical modelling of the active hearing process in mosquitoes
D Avitabile1, M Homer, A R Champneys
1Department of Engineering Mathematics, University of Bristol, University Walk, Bristol BS8 1TR, UK. d.avitabile@bristol.ac.uk
Journal of the Royal Society, Interface
|May 19, 2009
Summary
Mosquito antennae use active mechanical amplification via scolopidia to detect sound. A new model explains this process, matching experimental data and suggesting specific scolopidia are key to amplification.
Area of Science:
- * Bioacoustics
- * Insect biophysics
- * Mechanotransduction
Background:
- * Insects possess specialized morphological structures for capturing low-energy sound waves.
- * Mosquito acoustic energy capture and neural transduction involve active mechanical participation of scolopidia.
Purpose of the Study:
- * To propose a microscopic mechanistic model for active amplification in *Toxorhynchites brevipalpis* mosquito antennae.
- * To investigate the role of scolopidia in sound wave amplification and neuronal signaling.
Main Methods:
- * Development of a forced-damped oscillator model for the mosquito antenna.
- * Incorporation of active threads (scolopidia ensembles) providing impulsive force.
- * Modeling of channel dynamics triggered by critical antennal oscillation amplitude.
Main Results:
- * The model accurately replicates experimental findings: spontaneous oscillations, nonlinear amplification, hysteresis, 2:1 resonances, and frequency response.
- * The model explains gain loss under hypoxic conditions.
- * Simulations suggest scolopidia near the Johnston's organ tip drive entrainment and contribute most to amplification.
Conclusions:
- * The proposed model provides a quantitative and qualitative explanation for active amplification in mosquito antennae.
- * The findings highlight the crucial role of scolopidia in sound perception and suggest a hierarchical organization within Johnston's organ.
