Preserved myellin (IMAGE) Picower Institute at MIT Caption Green staining indicates myelination in these mouse brain cross sections. The brain that received 40Hz light and sound stimulation (right) shows significantly more myelin in four brain regions (insets): the cortex (CTX), the anterior commissure (AC), the corpus callosum (CC), and the striatum (STR) than in mice who did not receive 40Hz stimulation. Credit Tsai Laboratory/MIT Picower Institute Usage Restrictions with 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.