Induced movement-in-depth: relative location of static stimulus and direction asymmetry.

A rotating spiral stimulus induced prolonged movement-in-depth in a static circle concentric with its origin. Both were coated in luminous paint and viewed monocularly in the dark. Analysis showed that (a) longer induced movement was observed in the circle when it was central than when it was peripheral to the inducing stimulus, and (b) induced movement was perceived longer when towards the subject than when away from the subject.