After you have watched the falling of the water in a waterfall for about a minute, if you look at a blank surface, such as a white wall, you will get a sense of ______.
A)motion going upward, in the opposite direction of the falling water
B)motion going downward, in the same direction as the falling water
C)akinetopsia, seeing movement upward as separate images
D)akinetopsia, seeing movement downward as blurred images

Question

Quizplus · Accepted Answer

This phenomenon is due to the motion aftereffect, where the brain's perception adapts to motion in one direction, and when viewing a stationary scene afterwards, it appears to move in the opposite direction.

After You Have Watched the Falling of the Water in a Waterfall