The phi phenomenon demonstrates that illusions can be influenced by a. perceptions of movement b. perceptual constancies c. tricks in depth perception d. the situational context

The phi phenomenon demostrates that illusions can be influenced by movement - b. 

When different stimuli are in movement, this strongly influences our perception of said stimuli. This means that we will perceive them differently. 

A. Perceptions of Movement. The phi phenomenon is the optical illusion of perceiving a series of still images in rapid succession, giving the illusion of continuous motion, and movement. 

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