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  Intensity versus identity coding in an olfactory system

Stopfer, M., Jayaraman, V., & Laurent, G. (2003). Intensity versus identity coding in an olfactory system. Neuron, 39(6), 991-1004. doi:10.1016/j.neuron.2003.08.011.

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Stopfer, M., Author
Jayaraman, V., Author
Laurent, Gilles1, Author           
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1Neural systems Department, Max Planck Institute for Brain Research, Max Planck Society, ou_2461701              

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Free keywords: Action Potentials/*physiology Animals Female Grasshoppers/*physiology Male Mushroom Bodies/*physiology Neurons/physiology *Odorants Reaction Time/physiology Smell/*physiology
 Abstract: We examined the encoding and decoding of odor identity and intensity by neurons in the antennal lobe and the mushroom body, first and second relays, respectively, of the locust olfactory system. Increased odor concentration led to changes in the firing patterns of individual antennal lobe projection neurons (PNs), similar to those caused by changes in odor identity, thus potentially confounding representations for identity and concentration. However, when these time-varying responses were examined across many PNs, concentration-specific patterns clustered by identity, resolving the apparent confound. This is because PN ensemble representations changed relatively continuously over a range of concentrations of each odorant. The PNs' targets in the mushroom body-Kenyon cells (KCs)-had sparse identity-specific responses with diverse degrees of concentration invariance. The tuning of KCs to identity and concentration and the patterning of their responses are consistent with piecewise decoding of their PN inputs over oscillation-cycle length epochs.

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 Dates: 2003-09-16
 Publication Status: Issued
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 Identifiers: Other: 12971898
DOI: 10.1016/j.neuron.2003.08.011
ISSN: 0896-6273 (Print)0896-6273 (Linking)
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Title: Neuron
Source Genre: Journal
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Pages: - Volume / Issue: 39 (6) Sequence Number: - Start / End Page: 991 - 1004 Identifier: -