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Abstract
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The investigation was conducted on 120 full-blood, or almost full-blood children on the Yakima Indian reservation, Washington, and 110 white children living in the town of Toppenish, in the heart of the reservation. The use of speed as a test of excellence of performance, with difficulty kept constant, may be entirely unfair to some groups in which the speed factor does not have the significance habitually ascribed to it. The relatively better showing by the Indians on performance tests suggests that some at least, if not all, of the poor records obtained may be due to language difficulties and educational differences. The expression of quantitative differences between groups in terms of mental age, intelligence quotient, or points on a point scale, may hide interesting qualitative differences which deserve attention. (PsycINFO Database Record (c) 2006 APA, all rights reserved)
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