Fig 6. Plotted Z-scores for each regressor in the most significant brain areas for constant activation and activation following group RT. For the RIFG there is a significant fit to the experimental data for the model "brain activation with constant amplitude as function of word repetition." No significant fit was found for linear or nonlinear regressors. For the PCC, we found a significant fit for the model "positive nonlinear brain activation following group RT," whereas no significant fit was found for constant, linear, or nonlinear brain activation following individual RT. RIFG indicates right inferior frontal gyrus; indiv, individual.