EEG cap (IMAGE) University of Rochester Caption An electroencephalography (EEG) cap, which measures the electrical activity of the brain through the scalp, collects a mixture of signals coming from many different sources. Credit University of Rochester photo / J. Adam Fenster Usage Restrictions N/A License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.