Odor concentration invariance by chemical ratio coding

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Odor concentration invariance by chemical ratio coding

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Title: Odor concentration invariance by chemical ratio coding
Author: Uchida, Naoshige; Mainen, Zachary F.

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Citation: Uchida, Naoshige and Zachary F Mainen. 2008. Odor concentration invariance by chemical ratio coding. Frontiers in Systems Neuroscience 1(Article 3).
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Abstract: Many animal species rely on chemical signals to extract ecologically important information from the environment. Yet in natural conditions chemical signals will frequently undergo concentration changes that produce differences in both level and pattern of activation of olfactory receptor neurons. Thus, a central problem in olfactory processing is how the system is able to recognize the same stimulus across different concentrations. To signal species identity for mate recognition, some insects use the ratio of two components in a binary chemical mixture to produce a code that is invariant to dilution. Here, using psychophysical methods, we show that rats also classify binary odor mixtures according to the molar ratios of their components, spontaneously generalizing over at least a tenfold concentration range. These results indicate that extracting chemical ratio information is not restricted to pheromone signaling and suggest a general solution for concentration-invariant odor recognition by the mammalian olfactory system
Published Version: 10.3389/neuro.06.003.2007
Other Sources: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2526272/
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:11210454
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