Olfactory coding in the insect brain : data and conjectures

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European Journal of Neuroscience. 2014, 39(11), pp. 1784-1795. ISSN 0953-816X. eISSN 1460-9568. Available under: doi: 10.1111/ejn.12558
Zusammenfassung

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.

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Fachgebiet (DDC)
570 Biowissenschaften, Biologie
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Antennal lobe, mushroom bodies, neural networks, sensory coding
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ISO 690GALIZIA, C. Giovanni, 2014. Olfactory coding in the insect brain : data and conjectures. In: European Journal of Neuroscience. 2014, 39(11), pp. 1784-1795. ISSN 0953-816X. eISSN 1460-9568. Available under: doi: 10.1111/ejn.12558
BibTex
@article{Galizia2014-06Olfac-28482,
  year={2014},
  doi={10.1111/ejn.12558},
  title={Olfactory coding in the insect brain : data and conjectures},
  number={11},
  volume={39},
  issn={0953-816X},
  journal={European Journal of Neuroscience},
  pages={1784--1795},
  author={Galizia, C. Giovanni}
}
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