Default perception of high-speed motion

摘要: When human observers are exposed to even slight motion signals followed by brief visual transients—stimuli containing no detectable coherent signals—they perceive large and salient illusory jumps. This visually striking effect, which we call “high phi,” challenges well-entrenched assumptions about the perception of motion, namely minimal-motion principle breakdown with steps above an upper limit called dmax. Our experiments transients, such as texture randomization or contrast reversal, show that magnitude jump depends on spatial frequency transient duration—but not speed inducing signals—and direction duration inducer. Jump is robust across directions different types transient. In addition, when a actually displaced step beyond size dmax, expected; however, in presence inducer, again displacements at just summary, variety stimuli, find incoherent noise preceded small bias, instead perceiving little motion—as suggested principle—observers jumps whose amplitude closely follows their own dmax limits.