Figure 2. Variability in brain MAOA levels observed in healthy males. Parametric images of the model term which is a function of MAOA activity for two healthy individuals show the same planes of the brain. Brain λk3 for those individuals are 0.27 mLplasma(mLbrain)−1min−1 and 0.4 mLplasma(mLbrain)−1min−1 (top and bottom panels, respectively). A rainbow color scale is used where red represents the highest λk3 values.