Fig. 1.

Creation of virtual response patterns, schematic. (A) Arrow weight and shading depict the degree of activation of a virtual receptor (gray disk) by odorants (squares). (B) Activation of a grid of virtual receptors by one odorant. Lines connecting receptors symbolize neighborhood relationships in the SOM topology. (C) The resulting response pattern. Each rectangle corresponds to one receptor, where shades of gray indicate the strength of activation, as depicted on the scale to the right.