Mobilities of the cercal wind-receptor hairs of the cricket, Gryllus bimaculatus |
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Authors: | T Kumagai T Shimozawa Y Baba |
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Institution: | (1) Neuro-Cybernetics Laboratory, Research Institute for Electronic Science, Hokkaido University, Sapporo, 060 Japan, Fax: +81-11-706-4971 e-mail: tateo@ncp8.es.hokudai.ac.jp, JP |
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Abstract: | The deflection sensitivities of cercal filiform hairs of the cricket, Gryllus bimaculatus, were determined by direct measurement. The tangential velocity of deflecting hair shafts in response to stimulus air motion
was measured in situ by a laser-Doppler velocimeter with surface scattering of the shaft. The velocity of the stimulus air motion in a small wind
tunnel was calibrated by the same velocimeter with smoke from a joss-stick. The mobility of the hair was obtained from former
measurements with reference to the latter calibration of the single apparatus. A Gaussian white noise signal was employed
as a stimulus waveform, and the stimulus-response transfer function was calculated through a cross-correlation method, which
provides greater precision and wider frequency for a longer period of measurement. The mobility of hair was expressed in deflection
amplitudes and phase shifts in reference to the velocity sinusoid of a stimulus at various frequencies. The measurements established
the following conclusions. The wind receptor hairs comprise an array of mechanical band-pass filters whose best frequencies
are inversely proportional to the length. The motion dynamics of the wind-receptor hairs have strong damping.
Accepted: 24 February 1998 |
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Keywords: | Cricket Wind-receptor hair Size variation Mechanical band-pass filter Frequency-range fractionation |
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