Abstract
One implication of a stimulus-discriminability hypothesis to account for ease or difficulty of attaining concepts learned concurrently as paired associates was tested by repeating one of Heidbreder''s expts. Each of 27 college students learned nonsense names for 9 concepts presented in 16 lists. Intralist generalization (measured by intrusion errors) was found to account for the resulting order of learning as well as does the Heidbreder "thing-character" hypothesis: first-list intrusions correlated -.86 (p < .01) with correct responses and .69 (p< .05) with eventual order of attainment per concept.
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