Electroencephalography (image) University of Illinois at Urbana-Champaign Caption The researchers tracked brain activity in participants using electroencephalography, which captures signals from dozens of electrodes on the scalp. Credit Charles Hillman Usage Restrictions Image may be used only to accompany stories about the research described in this release. Credit required: Charles Hillman 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.