Related to the “Spacing Effect” that states that the effectiveness of learning is greater when spread over time compared to a single session. The Lag Effect states that we recall information better after longer lags between learning sessions than shorter lags. In 2005, Micheal. J. Kawana published the results of his experiment proving that his participants would recall the list of words when sufficient time would have passed between the sessions. It is believed that people start paying less attention when the learning sessions are repeated and massed.


Participants were asked to remember a list of words. There were three different list types: massed, spaced-short, and spaced-long. The results showed better recall in a spaced sessions and wider lags.

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