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One to study the mechanisms of forgetting was the German psychologist Hermann Ebbinghaus.
Using himself as the sole subject in his experiment, he memorized lists of three letter nonsense syllable words — two consonants and one vowel in the middle.
He then measured his own capacity to relearn a given list of words after a variety of given time period.
He found that forgetting occurs in a systematic manner, beginning rapidly and then leveling off.
Although his methods were primitive, his basic premises have held true today and have been reaffirmed by more methodologically sound methods.
The Ebbinghaus forgetting curve is the name of his results which he plotted out and made 2 conclusions.
The first being that much of what we forget is lost soon after it is originally learned.
The second being that the amount of forgetting eventually levels off.

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