Various implementations disclosed herein include devices, systems, and methods that assess physiological data of a user and a scene understanding of a physical environment to determine a retention state. For example, an example process may include obtaining physiological data in an environment during a first period of time. The process may further include identifying one or more of the objects in the environment based on determining a scene understanding of the environment. The process may further include determining, based on the physiological data and the scene understanding, features associated with interaction events for the one or more objects. The process may further include determining, based on the features, a retention state during the first period of time, the retention state associated with retention of a concept associated with an object of the one or more objects. The process may further include providing feedback based on identifying the retention state.