In the Sleep Laboratory (image) University of Bonn Caption Dr. Nadine Petrovsky and professor Dr. Ulrich Ettinger from the Institute of Psychology of the University of Bonn measure the filtering function of the brain in a test subject (center) using the prepulse inhibition. Credit (c) Photo: Volker Lannert/University of Bonn Usage Restrictions This photo may be used with the press release. 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.