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1963, Psychology Through Experiment (George Humphrey, Jaroslav Antonio Deutsch), page 90:
tolerance (Frenkel-Brunswik 1949) for it showed that those persons with the strongest defences against internal conflict, i.e. obsessionals and conversion hysterics, were those least able to perceive the reality-conflicting phenomenon of phi.
2007, Wayne Weiten, Psychology: Themes and Variations: Themes And Variations, page 138:
The illusion of movement in a highway construction sign is an instance of the phi phenomenon, which is also at work in motion pictures and television.
2013, Francis Glebas, The Animator's Eye: Composition and Design, page 66:
Is it the phi phenomenon or the persistence of vision? Originally, the illusion of motion that movies excel at was thought to be the effect of the persistence of vision.