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- Ali ibn Sahl Rabban al-Tabari
- Henri Tajfel, prejudice, social identity
- Lewis Terman
- Edward Thorndike, puzzle boxes, Connectionism
- L. L. Thurstone
- Edward Titchener
- Edward C. Tolman
- John Tooby
- Ellis Paul Torrance
- Anne Treisman
- Jeanne Tsai
- Endel Tulving
- Elliot Turiel, founder of Domain Theory (primary challenge to Kohlberg's stages of moral development)
- Amos Tversky
- David Tzuriel
Read more about this topic: List Of Psychologists