Figure 7.

Adaptation increases concentration identification error. A, Results of classification analysis for concentration discrimination between four levels (0.0, 0.1, 0.3, 1.0): average probability of classification (empty circles) of temporal patterns of MTCs at the first sniff as a function of concentration mismatch between actual concentration and classified concentration (1 corresponds to correct classification, 3(10) is the classification mismatch for 1(2) step threefold concentration differences) for different numbers of cells (shading from lightest to darkest corresponds to 1, 2, 4, 8, 16, 32, and 67 cells). Solid lines are Gaussian fits of classification probability: $p=p_1\mathrm{e}\mathrm{x}\mathrm{p}\left(-{\left(\Delta {\mathrm{l}\mathrm{o}\mathrm{g}}_{10}\left(\mathrm{C}\right)\right)}^2/{\mathrm{\sigma }}^2\right)$, where p1 is a probability of correct classification, and σ is the concentration classification error in log10 units. Inset, Concentration classification error as a function of number of cells included in classification. Vertical dashed line: threefold concentration difference. B, Classification performance for all 67 cells for different sniffs following odor onset (black, sniff 1; gray, sniffs 2-7). Inset: concentration classification error for sniff 1 (black) vs later sniffs (gray). Dashed line: median for sniffs 2+.