The way speed and accuracy trade off in human movement is well described by Fitts' law. The aim of the study I will discuss was to determine whether this law also holds for the perception of movement. Participants were shown displays of a person moving at various speeds between two targets that could vary in amplitude and width, and were asked to judge whether the person could perform such movements without missing the targets. Perceived movement times, defined in terms of the speeds at which participants provided an equal proportion of .possible. and .impossible. judgments, were successfully predicted by the index of difficulty of the movements, as stated by Fitts. law. Two subsequent experiments showed that this law also holds for the perception of non-human objects that resemble the human body, but it does not affect the perceived speed of human movement. These findings are consistent with an action-simulation account of action perception.
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