Flicking Internal Brain Switches On and Off (image) NIH/National Institute of Neurological Disorders and Stroke Share Print E-Mail Caption Scientists used mice to study how nerve cells in thalamic reticular nucleus work during sleep and how they help the brain concentrate. Credit Courtesy of Michael Halassa, M.D., Ph.D., NYU Langone Medical Center. Usage Restrictions For educational purposes only. Share Print E-Mail 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.