Estimation of Movement as a Function of the Distance of Movement Perception and Target Distance

Time course of visual extrapolation accuracy

“…Rosenbaum, 1975, Expt. 1;Slater-Hammel, 1955;Ellingstad, 1967;Wiener, 1962) do not always show such a decline. Peterken et al (1991) note that methodological problems obscure the interpretation of the results of many motion extrapolation studies.…”

Critical Time Intervals for Taking in Flight Information in a Ball-Catching Task

“…Would it be possible within one' perceptual moment' to obtain sufficient information about the velocity and direction of a ball in flight in order to Downloaded by [Imperial College London Library] predict its whereabouts at some future time and make a successful catch', or in such situations would further information be required (necessitating more than one' perceptual moment ') 1 It would seem obviousthat successful catching depends in part on the subject predicting the ball flight from the amount of ball trajectory viewed. In an investigation by Slater-Hammel (1955) subjects showed a tendency' to underestimate the velocity of a moving target when viewed at the shortest display distances. The target velocity was constant.…”

Movement prediction and movement production.

“…The typical protocol that has been used is a target moving in a straight line at a constant speed from point A to point B, and then disappearing behind an occluder. The subject's task is to press a button when the target is extrapolated to pass behind a marked point, C. Slater-Hammel (1955) found that subjects typically overestimated t BC , the time to travel between points B and C, by 10 -20%. In a fixed-speed paradigm, it was found that the overestimation of t BC increased with increasing distance BC, but that the subjective speed in the occluded region (i.e., BC/t BC ) increased, approaching its veridical value as BC increased.…”