Developmental Clock (IMAGE) University of California - San Diego Caption The "developmental clock" shows increases and decreases in brain's cortical surface, as well as the dynamic cascade of many other brain measures, all changing with increasing age (from age 3-20). Credit University of California San Diego of Medicine Usage Restrictions None License Licensed 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.