The coding of the courtship song by an identified auditory neurone in the cricketTeleogryllus oceaniens (Le Guillou)
- Cite this article as:
- Harrison, L., Horseman, G. & Lewis, B. J. Comp. Physiol. (1988) 163: 215. doi:10.1007/BF00612430
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Intracellular recordings were obtained from the ascending neurone ANA ofTeleogryllus oceanieus (Fig. 1 A). This neurone was identified by intracellular injection of Lucifer Yellow CH.
ANA typically shows inhibition in response to high intensities of low frequency tones (Fig. 1), but there is an additional underlying excitatory response (Fig. 2) which is revealed when the preparation is treated with 5×10−7M picrotoxin (Fig. 3).
In response to simulations of all three song types, presented at high intensities, the discharge produced by ANA maintains the fidelity of the temporal pattern of the trill phrase of the courtship song but not of the calling and aggression songs (Fig. 4).
The response of ANA to a simulation of the trill phrase of the natural courtship song involves the integration of post-synaptic inhibition and excitation (Fig. 5).
The extent of this integration is affected by the frequency content, intensity and syllable rate at which the simulation is presented (Fig. 6).
We hypothesize that ANA is involved in the neural pathway responsible for the recognition of the courtship song: this role and its known function in predator avoidance behaviour is discussed.
A series of double electrode experiments, carried out to investigate the source of the neurally mediated inhibition shown by ANA, provided no evidence for the existence of effective synaptic connections between the paired omega neurones, ON1 and ANA (Figs. 7, 8).