Forgetting

Memory researchers certainly haven’t forgotten Hermann Ebbinghaus, the first person to do scientific studies of forgetting, using himself as a subject. He spent a lot of time memorizing endless lists of nonsense syllables and then testing himself to see whether he remembered them. He found that he forgot most of what he learned during the first few hours after learning it.

Forgetting Curve

A forgetting curve is a graph that shows how quickly learned information is forgotten over time. Ebbinghaus made use of forgetting curves to chart his research on memory.

Measures of Forgetting and Retention

Researchers measure forgetting and retention in three different ways: recall, recognition, and relearning.

Recall

Recall is remembering without any external cues.

 For example, essay questions test recall of knowledge because nothing on a blank sheet of paper will jog the memory.