Abstract
Male American cockroaches were isolated from females upon becoming adults and were exposed one single time to sex pheromone on days 1 to 11, 13, or 15 after adult ecdysis. The behavioural components of adult male sexual behaviour are rapid antennation, erect body posture, locomotion, running, wing raising, and abdominal extension. These components appear after the adult ecdysis in the same sequence as they appear in later adult life in response to different concentrations of sex pheromone. The appearance of these behavioural components is described using two theoretical concepts, threshold and a “sequencer”. It is proposed that the components are ordered sequentially before or during ecdysis by the same “sequencer” that organizes the responses to different concentrations of pheromone. The appearance of the components during development is due to decreasing thresholds as the adult male matures.
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