Are reaction time and memory physiological measure or behavioral observation?
It may help considering whether the phenomenon is under some  control by the participant. Pupil dilation is a physiological measure, but the speed at which I hit a key (reaction time) is a behavioral measure. Memory is a phenomenon. If you meant recall, recognition, or another memory retrieval task, how could you measure that physiologically? Memory is generally measured through (somewhat controlled) self-report. However, it could also be probed through less controllable, more automatic reactions.