Prospective memory is a form of memory that involves remembering to perform a planned action or recall a planned intention at some future point in time.[1] Prospective memory tasks are common in daily life and range from the relatively simple to extreme life-or-death situations.[2] Examples of simple tasks include remembering to put the toothpaste cap back on, remembering to reply to an email, or remembering to return a rented movie. Examples of highly important situations include a patient remembering to take medication or a pilot remembering to perform specific safety procedures during a flight.
In contrast to prospective memory, retrospective memory involves remembering people, events, or words that have been encountered in the past.[3] Whereas retrospective memory requires only the recall of past events, prospective memory requires the exercise of retrospective memory at a time that has not yet occurred.[citation needed] Prospective memory is thus considered a form of "memory of the future".
Retrospective memory involves the memory of what we know, containing informational content; prospective memory focuses on when to act, rather than focusing on informational content.[4] There is some evidence demonstrating the role of retrospective memory in the successful execution of prospective memory, but this role seems to be relatively small.[5]