n. 1. refers to any type of voluntary movement. 2. an illusory perception of movement, for example, that experienced by pilots flying at night. This generally occurs when fixating on a dim, stationary light source in the dark.
n. 1. refers to any type of voluntary movement. 2. an illusory perception of movement, for example, that experienced by pilots flying at night. This generally occurs when fixating on a dim, stationary light source in the dark.