Abstract
The experiment tests an all-or-none theory for concept learning. The assumption tested is that the subject tries out cues (hypotheses) randomly without utilizing information from the past sequence to limit his search. The test condition run involved multiple shifts in relevancy of two cues during the course of learning. Contrary to prediction, this procedure retarded learning. A proposed revision assumes that the subject eliminates inconsistent cues but after awhile forgets that they had been eliminated. Quantitative assumptions to this effect accurately fit the present results. Related research is discussed which also is consistent with the revised sampling rule.
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