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Vygotsky blocks

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A test of concept formation in which the respondent is presented with 32 blocks differing in shape, colour, width, and height and is asked to sort them into categories according to codes written on their undersides. The respondent is not told the meaning of the codes, but blocks with the same code belong to the same category, one code being used for all tall and wide blocks, a second code for short and wide blocks, a third code for tall and thin blocks, and a fourth code for short and thin blocks, colour and shape being irrelevant. Also spelt Vigotsky blocks, and sometimes referred to as the Vygotsky test or Vigotsky test. [Named after the Russian psychologist Lev Semyonovich Vygotsky (1896–1934) who used them extensively in his research, though he credited their development to his colleague Leonid Solomonovich Sakharov (1900–28)]

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