Which measure of memory did Ebbinghaus use to assess the impact of rehearsal on the retention of nonsense syllables?

Question

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Ebbinghaus used relearning as a measure of memory, where he measured how much time it took for him to relearn a list of nonsense syllables that he had previously memorized. By comparing the time it took to initially learn the list to the time it took to relearn the list after varying periods of time, Ebbinghaus was able to assess the impact of rehearsal on retention.

Which Measure of Memory Did Ebbinghaus Use to Assess the Impact