Means that we regularly review Make the change from the short-term memory into long-term memory, which can be as long as a year or a lifetime, when the brain is more age starts showing unusual symptoms, come out to see.
Means that we have reviewed to date. Made the transition from short-term memory to long term memory. Which may be up to a year. Or life as they grow older, they begin to show signs of brain abnormalities were visible.
Means that we review memory always. Transition from short-term memory into long-term memory, which may be a long year. Or a lifetime when age begins to show symptoms of this thing out.