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Sparsening and Temporal Sharpening of Olfactory Representations in the Honeybee Mushroom Bodies

Sparsening and Temporal Sharpening of Olfactory Representations in the Honeybee Mushroom Bodies

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SZYSZKA, Paul, Mathias DITZEN, Alexander GALKIN, Cosmas Giovanni GALIZIA, Randolf MENZEL, 2005. Sparsening and Temporal Sharpening of Olfactory Representations in the Honeybee Mushroom Bodies. In: Journal of Neurophysiology. 94(5), pp. 3303-3313. ISSN 0022-3077. eISSN 1522-1598

@article{Szyszka2005Spars-8206, title={Sparsening and Temporal Sharpening of Olfactory Representations in the Honeybee Mushroom Bodies}, year={2005}, doi={10.1152/jn.00397.2005}, number={5}, volume={94}, issn={0022-3077}, journal={Journal of Neurophysiology}, pages={3303--3313}, author={Szyszka, Paul and Ditzen, Mathias and Galkin, Alexander and Galizia, Cosmas Giovanni and Menzel, Randolf} }

Ditzen, Mathias Galkin, Alexander Menzel, Randolf eng 2005 2011-03-24T17:41:25Z Szyszka, Paul Szyszka, Paul Galizia, Cosmas Giovanni Menzel, Randolf Galizia, Cosmas Giovanni Ditzen, Mathias We explored the transformations accompanying the transmission of odor information from the first-order processing area, the antennal lobe, to the mushroom body, a higherorder integration center in the insect brain. Using Ca2! imaging, we recorded activity in the dendrites of the projection neurons that connect the antennal lobe with the mushroom body. Next, we recorded the presynaptic terminals of these projection neurons. Finally, we characterized their postsynaptic partners, the intrinsic neurons of the mushroom body, the clawed Kenyon cells. We found fundamental differences in odor coding between the antennal lobe and the mushroom body. Odors evoked combinatorial activity patterns at all three processing stages, but the spatial patterns became progressively sparser along this path. Projection neuron dendrites and boutons showed similar response profiles, but the boutons were more narrowly tuned to odors. The transmission from projection neuron boutons to Kenyon cells was accompanied by a further sparsening of the population code. Activated Kenyon cells were highly odor specific. Furthermore, the onset of Kenyon cell responses to projection neurons occurred within the first 200 ms and complex temporal patterns were transformed into brief phasic responses. Thus two types of transformations occurred within the MB: sparsening of a combinatorial code,<br />mediated by pre- and postsynaptic processing within the mushroom body microcircuits, and temporal sharpening of postsynaptic Kenyon cell responses, probably involving a broader loop of inhibitory recurrent neurons. First publ. in: Journal of Neurophysiology 94 (2005), pp. 3303-3313 Sparsening and Temporal Sharpening of Olfactory Representations in the Honeybee Mushroom Bodies Galkin, Alexander 2011-03-24T17:41:25Z application/pdf deposit-license

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