This project contains the data and scripts related to our article “The P300 as marker of inhibitory control – fact or fiction?” as published in Cortex and bioRxiv. In short, the data sets contain EEG and EMG of healthy participants collected during a stop signal task. Task behavior, EEG, and EMG were analyzed. EEG analyses were set up to compare i) EEG-ERPs (normal preprocessing and averaging), ii) ERPs based on single subject ICA, iii) ERPs based on group-level ICA. Please check the methods section of our article, and the information and scripts provided here for details.