Format

Send to

Choose Destination
See comment in PubMed Commons below
Neural Comput. 2004 May;16(5):999-1012.

Odor-driven attractor dynamics in the antennal lobe allow for simple and rapid olfactory pattern classification.

Author information

  • 1Institute for Theoretical Biology, Humboldt-Universität zu Berlin, D-10115 Berlin, Germany. r.fdez@biologie.hu-berlin.de

Abstract

The antennal lobe plays a central role for odor processing in insects, as demonstrated by electrophysiological and imaging experiments. Here we analyze the detailed temporal evolution of glomerular activity patterns in the antennal lobe of honeybees. We represent these spatiotemporal patterns as trajectories in a multidimensional space, where each dimension accounts for the activity of one glomerulus. Our data show that the trajectories reach odor-specific steady states (attractors) that correspond to stable activity patterns at about 1 second after stimulus onset. As revealed by a detailed mathematical investigation, the trajectories are characterized by different phases: response onset, steady-state plateau, response offset, and periods of spontaneous activity. An analysis based on support-vector machines quantifies the odor specificity of the attractors and the optimal time needed for odor discrimination. The results support the hypothesis of a spatial olfactory code in the antennal lobe and suggest a perceptron-like readout mechanism that is biologically implemented in a downstream network, such as the mushroom body.

PMID:
15070507
DOI:
10.1162/089976604773135078
[PubMed - indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Atypon
    Loading ...
    Support Center