Effects of stimulus similarity on discrimination learning.

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Abstract
"Three groups of preschool children were given a successive discrimination learning task in which generalized (intralist) or nongeneralized (extralist) errors could be made....The results indicated that increased stimulus similarity results in greater numbers of both types of error...interpreted as reflecting increased stimulus generalization as a function of increased stimulus similarity. The increase in extralist errors...was interpreted as reflecting theoperation of factors in addition to stimulus generalization, e.g., decrease in interest, motivation...".
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