Abstract
WHEN Johnstone, Saunders and Johnstone1 measured the vibrational amplitude of the auditory tympana of the crickets Teleogryllus commodus and T. oceanicus in response to sound stimuli, they obtained curves with a sharp resonant peak at 5.0 kHz for both species (although in their text they described this resonant peak as occurring at 4.0 kHz1). They suggested that tympanic resonance is wholly responsible for the sharp tuning characteristics of primary auditory fibres in orthopterans2,3, and that “the functional significance of this tuning may be associated with the fact that the maximum energy in the (orthopteran) mating call lies in the 4.5–5.5 kHz range”1.
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