3D plot showing the results of trial-by-trial modeling of fMRI signal in the thalamus. fMRI signal evolution for RTs ranging from 0.2 s faster than mean RT for a given individual to 0.7 s slower than mean RT are displayed. The signal time course at the mean RT is marked in green. Lapses in SD significantly attenuated task-related thalamic activation. This contrasted with RW in which lapses were associated with significantly greater peak fMRI signal. Error bars represent SEM. *p < 0.01, **p < 0.001.