A list of 20 words was presented 4 times to 3 groups of Ss. After each presentation, Ss attempted to recall as many of the words as possible, in any order they wished. Two experimental groups then learned a second unrelated list for 6 such free-learning trials, while the third group (control) did not. One of the experimental groups had a changed environment for List-2 learning, while the other group was unchanged. Retention of both lists (MMFR) was tested either after List-2 learning or 24 hr. later. The control recalled List 1 better than the two experimental groups, which did not differ from each other. List-1 recall in the experimental groups did not change over time.
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