Odor-Driven Attractor Dynamics in the Antennal Lobe Allow for Simple and Rapid Olfactory Pattern Classification

Roberto Fdez. Galán, Silke Sachse, C. Giovanni Galizia, Andreas V. M. Herz
2004 Neural Computation  
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-speci c steady states (attractors) that
more » ... ctors) 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 supportvector machines quanti es the odor speci city 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. Neural Computation 16, 999-1012 (2004) c°2004 Massachusetts Institute of Technology
doi:10.1162/089976604773135078 pmid:15070507 fatcat:dummj5t52zckzmbt3mpzat3imy