Separating a and W effects: Pointing to targets on computer displays

Behavioral and Brain Sciences 20 (2):316-318 (1997)
We address two main issues: the distinction between time-constrained and spatially constrained tasks, and the separable A and W effects on movement time (MT) in spatially-constrained tasks. We consider MT and 3-D kinematic data from human adults pointing to targets in human-computer interaction. These are better fit by Welford's (1968) two-part model, than Fitts' (1954; Fitts & Peterson 1964) ID model. We identify theoretical and practical implications
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DOI 10.1017/S0140525X97361445
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