Forgetting (retention loss) refers to apparent loss of information already encoded and stored in an individual's long term memory. It's a spontaneous or gradual process in which old memories are unable to be recalled from memory storage. It's subject to delicately balanced optimization that ensures that relevant memories are recalled. Forgetting can be reduced by repetition and/or more elaborate cognitive processing of information. Reviewing information in ways that involve active retrieval seem… (More on Forgetting)