“…The dynamics of rivalry are sensitive to the contrast of the stimuli in the eyes if they are different, with such characteristic results as that increasing the contrast of one stimulus decreases the time during which that stimulus is suppressed much more than it increases the time that it is dominant (Levelt, 1965;Fox & Rasche, 1969;Blake, 1977;Mueller & Blake, 1989). There are also effects of the nature of the stimuli -for instance if two separate patterns are divided up between the two stimuli, then, in certain cases, the patterns will rival rather than the stimuli directly (Whittle, Bloor, Pocock, 1968;Kovacs, Papathomas, Yang & Feher, 1996), and there is some evidence that familiar patterns enjoy an advantage over unfamiliar ones during rivalry (see Yu & Blake, 1992).…”