02009nas a2200157 4500008004100000022001400041245008700055210006900142260001600211300001400227490000800241520151700249100002001766700001701786856004801803 1978 eng d a0340-759400aFunctional development of the auditory system of the cricket,Teleogryllus commodus0 aFunctional development of the auditory system of the cricketTele cJan-06-1978 a131 - 1380 v1273 a

1. In Teleogryllus commodus and T . oceanicus, vibration of the tibia of the prothoracic leg at audio-frequencies stimulates auditory receptors in the tympanal organ, despite immobilization of the large tympanum by vaseline.

2.Responses of characteristic auditory interneurons in the adult cervical connective are similar whether stimulation is by sound or by vibration of the tibia (Figs. 3–5).

3.Interneurons in second-last (A-2) and last (A-1) immature instars are stimulated by sound and by vibration of the tibia and we conclude that these interneurons are the same as those recorded in adults (Figs. 6, 7). Peripheral receptors and some interneurons in the immature auditory system are, therefore, physiologically competent.

4.At the imaginai moult, auditory threshold at the optimum frequency decreases dramatically (Fig. 8 A). This increase in sensitivity to sound is attributed mainly to the appearance of the auditory tympanum in the adult. There is a much smaller increase in sensitivity to vibration of the tibia at audio frequencies between last instar nymphs and adults (Fig. 8 B).

5.From the A-2 to adult stages of T. commodus, auditory receptors stimulated by sound show a peak sensitivity at 3.8 to 4.0 kHz (Fig. 8 A). Such tuning must be independent of vibration characteristics of the tympanum and of acoustic resonance characteristics depending on the dimensions of the leg trachea.

1 aBall, Eldon, E.1 aHill, K., G. uhttp://link.springer.com/10.1007/BF01352297