Abstract
Two groups of rats received two trials a day in a runway in the sequence RN or NR, and were then extinguished either in a single session or at a rate of one trial per day. With massed trials, Group NR extinguished more slowly; with spaced trials, Group RN tended to extinguish more slowly. These results are consistent with Capaldi’s sequential theory. A second experiment, however, showed that the difference in spaced extinction was not due to differences in between-day transitions (as Capaldi’s analysis might imply), but depended on whether or not Trial 1 of each day in acquisition was reinforced.
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