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The problem of discrimination reversal has recently been given a good deal of attention by various experimenters. The present experiment is designed to study the effect of problem difficulty on ease of discrimination reversal. The following specific question is asked: Will a discrimination reversal problem involving stimuli which fall near each other on the generalization gradient be more difficult than one using relatively dissimilar stimuli? METHOD SubjectsThe iS' s were 20 naive albino rats, approximately 00 days old, from the colony of the Psychology Department of Michigan Stale University. A pparalus:\ two-window Lashley-type jumping stand was employed. A feeding platform was behind (he windows, and a canvas net into which the iS' s fell after an incorrect response was attached below the windows. The apparatus was painted flat black. The stimulus cards used were as follows: Card 1 was a light gray similar to Munsell no. N 9/0 (6); Card 2, a slightly darker gray than Card 1, was similar to Munsell no. N" 8/0; and Card 3, a slightly darker gray than Card 2, was similar to Munsell no. M 7/0.

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