Figure 8.

Although individual odorants can stimulate much of the glomerular layer, relative levels of activity are very distinctive for different odorants. Color-coded contour charts are used to illustrate uptake evoked by seven different odorants. In the top row, responses are scaled as a ratio of uptake in each glomerular layer location to uptake measured in a consistent part of the subependymal zone, which is not expected to display odorant-dependent activity. Yellow or warmer colors indicate uptake that was above what was measured when rats were exposed to air vehicle only. In the bottom row, the same set of patterns are shown in a z score color scale, where yellow or warmer colors indicate uptake that is more than one standard deviation above the average uptake calculated across the glomerular layer. These patterns are very distinctive for different odorants. Outlined regions highlight consistent locations in the different charts. Whereas responses to different odorants in a given location do not seem as distinctive in the top row, the same locations are very differently active when viewed as relative (z score) responses in the bottom row.