Abstract
Two groups of Ss judged the similarity of pairs of patterns representing two different populations of stimuli. Pairs were composed of patterns drawn from either the same stimulus population or different stimulus populations. One group received nonspecific KR after rating the similarity of each pair. Nonspecific KR can only inform the S that the patterns are “similar” or “dissimilar,” not the degree of similarity. A control group received no KR. Both groups were able to differentiate the stimulus populations. The main effects of KR and of the same-different pattern pair classification variable were significant. There was also a significant KR by Trials interaction. Analysis of KR over trials suggested that KR caused a shift in mean similarity judgments on the response scale. An explanation of this shift was offered in terms of frequency matching by the KR group.
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This research was supported by the Department of Defense, Project THEMIS contract (DAADO5-68-C-0176), under the Department of the Army, to the Institute for the Study of Cognitive Systems through the TCU Research Foundation.
The assistance of Professor Selby H. Evans is gratefully acknowledged.
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Breckenridge, R.L., Rankin, W.C. & Wright, A.D. The effect of KR on ratings of pattern similarity. Psychon Sci 15, 223–224 (1969). https://doi.org/10.3758/BF03336294
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DOI: https://doi.org/10.3758/BF03336294