reaction time variability.Eichele et al. (2005) were one of the first to investigate the spatio-temporal evolution for BOLD correlates of event-related potential (ERP) components spanning the entire trial. Their approach, applied to an auditory oddball paradigm, used ICA to denoise the EEG from which they then selected a specific subset of electrodes to construct single-trial variability regressors for well defined ERPs (e.g. P2, N2 and P3).