The phi phenomenon concerns only the perception of movement between two stationary objects, as if a shadow were moving between them; it does not involve any perception of change in the objects’ positions. In contrast, beta movement involves an actual and perceived change in the position of an object presented in different positions in quick succession, which creates the illusion that the object is moving. Whereas the phi phenomenon requires shorter time intervals between visual stimuli, beta movement can be observed with longer intervals.
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