30 brain-damaged and 30 non-brain-damaged Ss were administered two tests of equivalence range (ER), and a simple and complex concept formation problem. It was hypothesized that the brain-damaged Ss would have narrower ERs and poorer concept-formation ability than the non-brain-damaged Ss, and that there would be a positive relationship between breadth of ER and concept-formation ability. Full support was found for the first hypothesis, but the second one was only supported for the simple conceptual task. It was concluded that a broad ER may be a necessary but not sufficient condition for efficient concept formation.
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