Draft version of manuscript IN PRESS in the Journal of Experimental Psychology: Human Perception and Performance The Perception of Visual Speed While Moving

During self-motion, the world normally appears stationary. In part, this may be due to reductions in visual motion signals during self-motion. In eight experiments using magnitude estimation to characterize changes in visual speed perception as a result of biomechanical self-motion alone (treadmill walking), physical translation alone (passive transport) and both biomechanical self-motion and physical translation together (walking), shows that each factor alone produces subtractive reductions in visual speed but that subtraction is greatest with both together, approximating the sum of the two separately. The similarity of results for biomechanical and passive self-motion support Barlow’s (1990) inhibition theory of sensory correlation as a mechanism for implementing Wallach’s (1987) compensation for self-motion.