Motion asymmetry theory: A unifying account of motion/position illusions?
Bannemiller, James L.
Master of Arts
The motion/position illusion refers to phenomena in which an object is systematically mislocalized in the presence of motion. The object's location is usually misperceived in the direction of motion. We tested the hypothesis that motion asymmetry theory could account for the flash-lag illusion, and determined its potential as a unifying theory of motion/position illusions. We showed that the flash-lag illusion could not be explained by the theory based on two results. First, we found that it was the trailing edge that was primarily misperceived in the direction of motion, rather than the leading edge predicted by the theory. Second, we found that the size of the perceived centroid shift of the moving object produced by edge misperception was not sufficient to explain the magnitude of the flash-lag illusion. Our results suggest that the flash-lag illusion involves more than simply the mislocalization of the edges of a moving object. Keywords: flash-lag illusion, motion asymmetry theory, perceived centroid shift, leading/trailing edge misperception
Psychology; Experiments; Cognitive therapy; Psychology