Utilizing material from 500 dreams of 19 Ss, the authors constructed a reliable rating scale for primary-process thinking. The tendency to allow primary process in one's dream reports is a stable trait over a 3-wk. period. This tendency is correlated (r = .60) with the average length of S's dreams. Dreams of the same night are more alike than dreams of different nights. The primaryprocess scale correlates highly (r ~ .84) with a count of the number of different primary-process mechanisms. Finally, the various primary-process mechanisms in these dreams can be plausibly ordered along a continuum from secondary-to primary-process functioning.
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