Abstract
THERE is a simple rule that defines which of the symbols of Fig. 1 fall into group A and which into group B. It can be expressed in thirteen words, but the reader is unlikely to guess it—even if we tell him that the only relevant differences between the patterns are in symmetry, dot colour and dot shape.
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DENNIS, I., HAMPTON, J. & LEA, S. New Problem in Concept Formation. Nature 243, 101–102 (1973). https://doi.org/10.1038/243101a0
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DOI: https://doi.org/10.1038/243101a0
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