William Allen and James Higham, of New York University, and Martin Stevens, of the University of Exeter, analyzed the unique faces of 22 guenon species. Their work, which provides some of the best evidence for the role of visual signals as impediments to breeding across species, is published in the
Martin Stevens at the University of Exeter has researched the motion dazzle hypothesis by getting human subjects to catch moving stripy objects on a computer. Its an artificial experimental system, he admitted.