Polar and Cartesian Structure in the Data of Fitts's (1954) Classic Experiments-with a Criterion for Distinguishing a Strong and a Weak Version of Fitts' Law.
JOURNAL OF MOTOR BEHAVIOR(2020)
摘要
The time T needed to reach a target of width W located at distance D varies as a logarithmic or power function of the quotient of D/W. The received, strong version of Fitts' law requires isochrony-the invariance of T across different D/W conditions with the same quotient-but there is room for a weaker, yet nontrivial version of Fitts' law where scale influences T without interacting with the crucial quotient. The data of Fitts's historic experiments are submitted to Cartesian/polar analysis. While tapping beautifully illustrates the strong, isochronous version of Fitts' law, contrary to a widespread belief Fitts's other two experiments were not just half-failed corroborations: The disc-transfer data eloquently illustrate the weak version of Fitts' law, and the pin-transfer data flatly violate the law. Surprisingly, however, the pin-transfer data are remarkably simple in the alternative Cartesian description system, factors D and W exerting separate, additive effects on T.
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关键词
Aimed movement,Cartesian,polar analysis,Fitts' law,scale,isochrony
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