The monotonicity of the response x (x = maximal spike density function (SDF) or averaged SDF, each across all glomeruli) in this context was calculated as. m=x10-1-maxxmeanx, i.e. the difference between the SDF at the highest tested odour concentration ( 10-1) and the highest observed SDF, normalised by the mean observed SDF, where the maximum and mean were taken across all concentrations from 10-7 to 10-1 . Monotonicity takes values smaller or equal 0, and monotonic odours have m=0 .
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