If you are sitting on a stationary train and see another train on an adjacent parallel track start to move in a direction opposite to the one in which you are facing, you sometimes get the sensation of yourself moving forward. This phenomenon is referred to as __________.

A) induced motion of the self
B) motion parallax
C) binocular disparity
D) interposition

This phenomenon is called induced motion of the self, as the movement of the other train creates a visual illusion that the observer is moving in the opposite direction. Motion parallax refers to the relative motion of objects at different distances when the observer is moving, binocular disparity is the difference in the images seen by the left and right eye, and interposition refers to one object appearing to be in front of another.