In an apparent motion demonstration, two pictures are used. in one picture a person's fist is located behind his head; in the other, the person's fist is located in front of their face at the same height. when slowly alternating between these pictures (less the five times a second), what apparent motion would result?
incorrecta. the fist would appear to "magically" pass through the head.
answers:
a. the fist would appear to "magically" pass through the head.
b. the fist would appear to smash the head.
c. no apparent motion would occur because the alternation is too slow.
d. the fist would appear to go around the side of the head.

The answer is: The fist would appear to go around the side of the head.

Explanation:

Apparent Motion can be easily described by comparing it to animation. In animation by using a quick succession of images a viewer is tricked into thinking that inanimate objects are moving, In other words apparent motion  is an  an optical illusion that makes a still object appear to move. It is achieved by flashing pictures of a still image in different locations so quickly that the image seems to move from one location to the other.

If you imagine the situation presented to you in this example, the succession of fist in front of the face and fist behind the head would give you the illusion that the fist is going around the side of the head.

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