Drosophila melanogaster larvae were pre-stimulated with high concentrations of six homologous alcohols (C4^C9) and then tested for adaptation and cross-adaptation using these same alcohols, four aliphatic n-acetates and three acids. Pre-stimulation with hexanol e¡ectively reduced to zero (abolished) test responses to all six alcohols, whereas test responses to hexanol were only a¡ected by pre-stimulation with hexanol. This substance appears to play a fundamental role in the organization of the larval olfactory system. Test responses to butanol and pentanol, and the e¡ect of pre-stimulation with butanol and pentanol, were not signi¢cantly di¡erent, indicating that they are sensory equivalents. Heptanol, octanol and nonanol induce a complex set of responses among one another. Cross-adaptation between functional groups was observed, in particular following pre-stimulation with hexanol, but there was also evidence that functional groups are coded separately. A model of olfactory processing in the fruit£y maggot is presented that explains the data and provides predictions for future anatomical, genetic and electrophysiological studies.
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