Abstract
When a critical list (CL) was learned to a very high level of mastery, delayed interference conditions (an interfering list, IL, learned several days after the learning of CL) were found to produce more interference than immediate interference conditions (the IL learned immediately after the learning of CL). Undergraduates served as Ss. This phenomenon was predicted from the hypothesis that the amount of interference measurable is inversely related to level of recall of CL in control conditions a hypothesis derived from previous experiments analyzing recall of individual items within CL. The delayed interference effect was observed at 2 CL-IL intervals (2 and 4 days), and was replicated in 2 independent experiments. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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