FIGURE 1. Odour images in the olfactory glomerular layer.

a, Diagram showing the relationship between the olfactory receptor cell sheet in the nose and the glomeruli of the olfactory bulb⁵³. b, fMRI images of the different but overlapping activity patterns seen in the glomerular layer of the olfactory bulb of a mouse exposed to members of the straight-chain aldehyde series, varying from four to six carbon atoms. The lower part of the image in the left panel corresponds to the image on the medial side of the olfactory glomerular layer as shown in a (see asterisk). (Image in a adapted, with permission, from ref. 53; image in b adapted, with permission, from ref. 10.)