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Two Modes of Motion Perception A Double-dissociation of the effects of contrast and field of view on perception of object-motion and self-motion



Two Modes of Motion Perception A Double-dissociation of the effects of contrast and field of view on perception of object-motion and self-motion







Several studies have shown that reduced contrast causes an illusory reduction in the perceived speed (e.g., Thompson, 1982). However, a more recent investigation of driving behavior found no effect of reduced contrast on drivers' perception and control of their vehicle's speed (Owens, Wood, whereas, reduced FOV affects perception of self-motion but not perception of object-motion. Consistent with previous investigations of the effects of blur and reduced luminance on vection and vehicle control (Leibowitz et al., 1979; Owens et al., 1999, 27, 21), the present findings add evidence for two functionally distinct modes of vision: a focal mode that mediates object perception and an ambient mode that mediates perception of posture and self-motion.

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