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Olfactory coding in the insect brain: data and conjectures
Much progress has been made recently in understanding how olfactory coding works in insect brains. Here, I propose a wiring diagram for the major steps from the first processing network (the antennal lobe) to behavioral readout. I argue that the sequence of lateral inhibition in the antennal lobe, n...
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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BlackWell Publishing Ltd
2014
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4237541/ https://www.ncbi.nlm.nih.gov/pubmed/24698302 http://dx.doi.org/10.1111/ejn.12558 |
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author | Galizia, C Giovanni |
author_facet | Galizia, C Giovanni |
author_sort | Galizia, C Giovanni |
collection | PubMed |
description | Much progress has been made recently in understanding how olfactory coding works in insect brains. Here, I propose a wiring diagram for the major steps from the first processing network (the antennal lobe) to behavioral readout. I argue that the sequence of lateral inhibition in the antennal lobe, non-linear synapses, threshold-regulating gated spring network, selective lateral inhibitory networks across glomeruli, and feedforward inhibition to the lateral protocerebrum cover most of the experimental results from different research groups and model species. I propose that the main difference between mushroom bodies and the lateral protocerebrum is not about learned vs. innate behavior. Rather, mushroom bodies perform odor identification, whereas the lateral protocerebrum performs odor evaluation (both learned and innate). I discuss the concepts of labeled line and combinatorial coding and postulate that, under restrictive experimental conditions, these networks lead to an apparent existence of ‘labeled line’ coding for special odors. Modulatory networks are proposed as switches between different evaluating systems in the lateral protocerebrum. A review of experimental data and theoretical conjectures both contribute to this synthesis, creating new hypotheses for future research. |
format | Online Article Text |
id | pubmed-4237541 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2014 |
publisher | BlackWell Publishing Ltd |
record_format | MEDLINE/PubMed |
spelling | pubmed-42375412014-12-15 Olfactory coding in the insect brain: data and conjectures Galizia, C Giovanni Eur J Neurosci Special Issue: Editors' Issue 2014 Much progress has been made recently in understanding how olfactory coding works in insect brains. Here, I propose a wiring diagram for the major steps from the first processing network (the antennal lobe) to behavioral readout. I argue that the sequence of lateral inhibition in the antennal lobe, non-linear synapses, threshold-regulating gated spring network, selective lateral inhibitory networks across glomeruli, and feedforward inhibition to the lateral protocerebrum cover most of the experimental results from different research groups and model species. I propose that the main difference between mushroom bodies and the lateral protocerebrum is not about learned vs. innate behavior. Rather, mushroom bodies perform odor identification, whereas the lateral protocerebrum performs odor evaluation (both learned and innate). I discuss the concepts of labeled line and combinatorial coding and postulate that, under restrictive experimental conditions, these networks lead to an apparent existence of ‘labeled line’ coding for special odors. Modulatory networks are proposed as switches between different evaluating systems in the lateral protocerebrum. A review of experimental data and theoretical conjectures both contribute to this synthesis, creating new hypotheses for future research. BlackWell Publishing Ltd 2014-06 2014-04-03 /pmc/articles/PMC4237541/ /pubmed/24698302 http://dx.doi.org/10.1111/ejn.12558 Text en Copyright © 2014 Federation of European Neuroscience Societies and John Wiley & Sons Ltd http://creativecommons.org/licenses/by-nc-nd/3.0/ This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made. |
spellingShingle | Special Issue: Editors' Issue 2014 Galizia, C Giovanni Olfactory coding in the insect brain: data and conjectures |
title | Olfactory coding in the insect brain: data and conjectures |
title_full | Olfactory coding in the insect brain: data and conjectures |
title_fullStr | Olfactory coding in the insect brain: data and conjectures |
title_full_unstemmed | Olfactory coding in the insect brain: data and conjectures |
title_short | Olfactory coding in the insect brain: data and conjectures |
title_sort | olfactory coding in the insect brain: data and conjectures |
topic | Special Issue: Editors' Issue 2014 |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4237541/ https://www.ncbi.nlm.nih.gov/pubmed/24698302 http://dx.doi.org/10.1111/ejn.12558 |
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