Protocols (IMAGE) RIKEN Caption This graphic shows protocols for massed (M) and spaced (S0.5h-S1d-2) learning. Mice were trained their optokinetic eye movements by 1 hour of concentrated protocol or 2.5 hours-8 days of spaced protocols. Credit RIKEN 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.