The motion aftereffect (MAE) is a visual illusion experienced after viewing a moving visual stimulus for a time (tens of milliseconds to minutes) with stationary eyes, and then fixating a stationary stimulus. The stationary stimulus appears to move in the opposite direction to the original (physically moving) stimulus. The motion aftereffect is believed to be the result of motion adaptation.
For example, if one looks at a waterfall for about a minute and then looks at the stationary rocks at the side of the waterfall, these rocks appear to be moving upwards slightly. The illusory upwards movement is the motion aftereffect. This particular motion aftereffect is also known as the waterfall illusion.
Another example can be seen when one looks at the center of a rotating spiral for several seconds. The spiral can exhibit outward or inward motion. When one then looks at any stationary pattern, it appears to be moving in the opposite direction. This form of the motion aftereffect is known as the spiral aftereffect.
Read more about Motion Aftereffect: Explanation, History
Famous quotes containing the word motion:
“I still think I ought to leave Washington well alone. I have many friends in that city who can of their own motion speak confidently of my ways of thinking and acting. An authorized representative could remove some troubles that you now see, but only think of yet greater troubles he might create.”
—Rutherford Birchard Hayes (1822–1893)