cEEGrid (IMAGE) University of Oldenburg Caption Not a hearing aid but a compact EEG: Martin Bleichner uses a small number of electrodes attached around the ear to monitor brain activity triggered by sounds. Photo: Uni Oldenburg Credit University of Oldenburg Usage Restrictions Only to be used in connection with the story and with appropriate credit. 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.