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Stroop Effect

  1. Colin M. MacLeod

Published Online: 30 JAN 2010

DOI: 10.1002/9780470479216.corpsy0952

Corsini Encyclopedia of Psychology

Corsini Encyclopedia of Psychology

How to Cite

MacLeod, C. M. 2010. Stroop Effect. Corsini Encyclopedia of Psychology. 1–2.

Author Information

  1. University of Waterloo, Canada

Publication History

  1. Published Online: 30 JAN 2010


Since psychology's earliest days, we have known that it takes considerably more time to name objects or their properties than to read the corresponding words. Cattell (1886) demonstrated this difference in his dissertation: Saying “horse” to a picture of a horse or “blue” to a blue color patch took more time than did reading the word horse or blue aloud. Cattell attributed this difference to the automaticity of word reading that is developed through extensive practice.


  • attention;
  • automaticity;
  • brain imaging;
  • cognition;
  • connectionist modeling;
  • emotion;
  • interference;
  • learning;
  • practice;
  • priming