Ss saw a series of 6 consecutively presented vertical lines differing in length in increasing, decreasing, or random order and then were asked to recognize a 7th line as identical with a series line. In some conditions, to test for a frame-of-reference effect, the 6th line was unusually long or short.4 increasing and 4 decreasing length conditions produced significantly less error than 3 random conditions. Frame-ofreference and discrimination-interference decrements were found for increasing length conditions, but only discrimination-interference decrements were found for decreasing length conditions. A related finding was that when the longest line was 1st in a series it had a retention advantage. A consistent memory bias suggests a reason for predominance of aftergradients in so-called "spread-of-effect" experiments.
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