飛現象(英語:Phi phenomenon)是一個由马科斯·韦特墨在1912年的一篇期刊文章《Experimental Studies on the Seeing of Motion》所提出的知覺錯覺現象(錯視)。其中描述一連串靜態圖片卻會造成移動的錯覺。在討論電影和視訊原理時,常會被誤認為貝塔運動。但這兩個其實是不同的現象。
Phi is not Beta (页面存档备份,存于互联网档案馆) – An explanation of the difference between the beta and phi phenomena, with online demonstrations of both, and a stronger version of phi than that found by Wertheimer.
The Myth of Persistence of Vision Revisited – A detailed explanation of how the perception of motion in film and video differs from the simplest notions of "persistence of vision", with mention of the erroneous use of phi as a revised explanation.