the failure to retrieve information from memory. (273) forgetting curve: a graph showing that forgetting is initially rapid and then slows. (286) formal operational stage: the Piagetian stage, beginning at about age 12, marked by the ability to use abstract reasoning and to solve problems by testing hypotheses. (131)

The inability to retrieve memory from long-term storage. go to glossary index

Forgetting (retention loss) is a spontaneous or gradual process in which old memories are unable to be recalled from memory storage. It is subject to delicately balanced optimization that ensures that relevant memories are recalled. Forgetting can be prevented by repetition and/or evaluation of the information.