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phi-phenomenon

[fahy-fi-nom-uh-non, -nuh n] /ˈfaɪ fɪˌnɒm əˌnɒn, -nən/
noun, plural phi-phenomena
[fahy-fi-nom-uh-nuh] /ˈfaɪ fɪˌnɒm ə nə/ (Show IPA).
Psychology
1.
motion perceived by a subject, especially the illusion of movement produced when stationary stimuli, as pictures or lights, are presented in rapid succession and are sometimes in slightly different positions.
Origin
1925-1930
1925-30
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for phiphenomenon

phi-phenomenon

/ˈfaɪfɪˌnɒmɪnən/
noun (psychol) (pl) -na (-nə)
1.
the illusion that when two lights are rapidly turned on and off in succession something appears to move backwards and forwards between them while the lights stay stationary
2.
a similar illusion in which one light appears to move smoothly backwards and forwards
Word Origin
C20: arbitrary use of Greek phi
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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