Fig. 3From: Error-related brain state analysis using electroencephalography in conjunction with functional near-infrared spectroscopy during a complex surgical motor taskFlowchart of the steps for fNIRS–EEG preprocessing in HOMER3 and EEGlab, respectively, and the fNIRS post-processing using the EEG regressors and the short-separation HbO regressors in HOMER3Back to article page