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

Published online by Cambridge University Press:  30 August 2019

Christine L. MacKenzie  and
Evan D. Graham
Christine L. MacKenzie
Affiliation:
School of Kinesiology, Simon Fraser University, Burnaby, B.C., Canada, V5A 1S6 [email protected][email protected]/css/members/mackenzie.html
Evan D. Graham
Affiliation:
School of Kinesiology, Simon Fraser University, Burnaby, B.C., Canada, V5A 1S6 [email protected][email protected]/css/members/mackenzie.html
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Abstract

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.

Type
Open Peer Commentary
Information
Behavioral and Brain Sciences , Volume 20 , Issue 2 , June 1997 , pp. 316 - 318
Copyright
1997 Cambridge University Press

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