Classification and quantitative judgement
Tajfel and Wilkes, British Journal of Psychology 54(2), 1963, 101-114. When classification followed a physical scale, stimuli in different classes were judged farther apart than in an unclassified series; classification unrelated to the scale had no such effect; past experience with classification increased apparent differences between classes and similarity within a class; the authors connected the findings to stereotyping.
Tajfel and Wilkes, British Journal of Psychology 54(2), 1963, 101-114. When classification followed a physical scale, stimuli in different classes were judged farther apart than in an unclassified series; classification unrelated to the scale had no such effect; past experience with classification increased apparent differences between classes and similarity within a class; the authors connected the findings to stereotyping.
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Tajfel, H., & Wilkes, A. L. (1963). Classification and quantitative judgement. British Journal of Psychology, 54(2), 101-114. doi:10.1111/j.2044-8295.1963.tb00865.x https://doi.org/10.1111/j.2044-8295.1963.tb00865.x