In contrast, mixing attractants with repellents elicits responses that are lower than the responses towards the corresponding attractants. We show that binary mixtures of attractants are more attractive than individual mixture constituents. In this study we examine whether the innate valence of odors is conserved in binary odor mixtures. While there is ample evidence for the relevance of complex odor blends in ecological interactions and for interactions of chemicals in both peripheral and central neuronal processing, a fine-scale analysis of rules governing the innate behavioral responses of Drosophila melanogaster towards odor mixtures is lacking. Most naturally occurring olfactory signals do not consist of monomolecular odorants but, rather, are mixtures whose composition and concentration ratios vary.
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