Hierarchies in concept attainment.

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Abstract
"Twenty Ss were employed in a study of the relative difficulty of attaining 10 different types of concepts. All types involved only the presence or absence of two properties, but some were hierarchically more complex than others. For example, 'Both A and B' is more complex than 'A' but less complex than 'Both A and B or neither.' The results indicate that the difficulty of a concept varies directly with its complexity. This order of difficulty does not appear when a computer program is used to attain the concept by simple elimination. It seems to reflect a hierarchical organization of conceptual processes in the Ss themselves." (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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