STRATEGY MODIFICATION IN CONCEPT LEARNING AS A FUNCTION OF INTRADIMENSIONAL VARIABILITY

LINDAHL, M.-B. Strategy modification in concept learning as a function of intradimensional variability. Scand. J. Psychol. , 1971, 12, 90–98.–60 subjects took part in a concept-learning-like task, where the independent variable was the intradimensional variability of the instances and the dependent variable was the type of strategy adopted by the subjects. Two main types of strategy were used by the subjects: one based on subtle cues and in principle requiring only one instance to lead to solution (conceptual-deductive strategy) and one based on salient cues and requiring a number of instances for solution (perceptual-inductive strategy). Adoptions of a conceptual-deductive type of strategy were shown to be significantly more frequent, when the variability was large than when it was small. It was concluded that the intradimensional variability of the instances influenced the subjects' choice of strategy in a seemingly rational way. This type of strategy modification was considered to be in line with theories describing concept learning as a sequence of, in principle, rational decisions.