Abstract
A quantitative study of the electroantennogram (EAG) of Trichoplusia ni (Hübner) response to sex pheromone has provided new information about the physiological basis of the EAG and its relationship to behaviour. Procedures were developed that selectively stimulated defined numbers of sensilla and eliminated extraneous olfactory stimuli. The results show that the EAG is linearly proportional to the number of antennal sensilla stimulated and clarify interpretation of the blank response. Studies with calibrated dispensers indicate that the EAG is related to pheromone concentration by a power function frequently associated with quantitative measures of electrophysiological and behavioural responses in other animals. Based on correlations between the EAG, behaviour, and single-neurone responses, a model is presented that interrelates these three parameters as different indicators of a single quantitative process in the central nervous system.
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