Interference and forgetting.

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Abstract
"This paper deals with issues in the forgetting of rote-learned material An analysis of the current evidence suggests that the classical Ebbinghaus curve of forgetting is primarily a function of interference from materials learned previously in the laboratory. When this source of interference is removed, forgetting decreases from about 75 per cent over 24 hours to about 25 per cent. This latter figure can be reduced by at least 10 per cent by other methodological considerations, leaving 15 per cent as an estimate of the forgetting over 24 hours. This estimate will vary somewhat as a function of intratask similarity, distributed practice, and with very low meaningful material. But the overall evidence suggests that similarity with other material and situational similarity are by far the most critical factors in forgetting. Such evidence is consonant with a general interference theory, although the details of such a theory were not presented here.".
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