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Short-term memory in olfactory network dynamics

Stopfer, Mark and Laurent, Gilles (1999) Short-term memory in olfactory network dynamics. Nature, 402 (6762). pp. 664-668. ISSN 0028-0836. doi:10.1038/45244.

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Neural assemblies in a number of animal species display self-organized, synchronized oscillations in response to sensory stimuli in a variety of brain areas. In the olfactory system of insects, odour-evoked oscillatory synchronization of antennal lobe projection neurons (PNs) is superimposed on slower and stimulus-specific temporal activity patterns. Hence, each odour activates a specific and dynamic projection neuron assembly whose evolution during a stimulus is locked to the oscillation clock. Here we examine, using locusts, the changes in population dynamics of projection-neuron assemblies over repeated odour stimulations, as would occur when an animal first encounters and then repeatedly samples an odour for identification or localization. We find that the responses of these assemblies rapidly decrease in intensity, while they show a marked increase in spike time precision and inter-neuronal oscillatory coherence. Once established, this enhanced precision in the representation endures for several minutes. This change is stimulus-specific, and depends on events within the antennal lobe circuits, independent of olfactory receptor adaptation: it may thus constitute a form of sensory memory. Our results suggest that this progressive change in olfactory network dynamics serves to converge, over repeated odour samplings, on a more precise and readily classifiable odour representation, using relational information contained across neural assemblies.

Item Type:Article
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URLURL TypeDescription ReadCube access Information
Laurent, Gilles0000-0002-2296-114X
Additional Information:© 1999 Macmillan Magazines Ltd. Received 23 August; accepted 22 October 1999. We thank B. Smith for help with the statistical analysis of the data. This work was supported by an NRSA from the NIDCD (M.S.), and the NIDCD and the Alfred P. Sloan Foundation (G.L.).
Funding AgencyGrant Number
National Institute on Deafness and Other Communication DisordersUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Issue or Number:6762
Record Number:CaltechAUTHORS:20150616-084753006
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58271
Deposited By: Tony Diaz
Deposited On:16 Jun 2015 16:17
Last Modified:10 Nov 2021 22:02

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