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The point of observation translates with eye movement because it is not coincident with the center of rotation in the eye. "Ocular occlusion" results. The amount of optical structure revealed by eye rotation depends on the distances of the occluding and occluded surfaces. The method of adjustment was used in Expt 1 to investigate the amount of structure(More)
Old age is associated with reduced mobility of the hand. To investigate age related decline when reaching-to-lift an object we used sophisticated kinematic apparatus to record reaches carried out by healthy older and younger participants. Three objects of different widths were placed at three different distances, with objects having either a high or low(More)
information plays a crucial role in the prospective control of locomotion. It provides observers with the requisite perceptual information to plan their movements adap-tively. For example, walkers must lift their feet to avoid tripping over the curb and veer to avoid slipping on a slick patch of ice. A variety of visual depth cues—texture gradients , linear(More)
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