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Grasping at laws : speed-accuracy trade-offs in manual prehension
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McIntosh, Robert D., Mon-Williams, Mark and Tresilian, James (2018) Grasping at laws : speed-accuracy trade-offs in manual prehension. Journal of experimental psychology. Human perception and performance, 44 (7). pp. 1022-1037. doi:10.1037/xhp0000512 ISSN 1939-1277.
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Official URL: https://doi.org/10.1037/xhp0000512
Abstract
Most of human performance is subject to speed-accuracy trade-offs. For spatially constrained aiming, the trade-off is often said to take the specific form of Fitts' law, in which movement duration is predicted from a single factor combining target distance and target size. However, efforts to extend this law to the three-dimensional context of reaching to grasp (prehension) have had limited success. We suggest that there are potentially confounding influences in standard grasping, and we introduce a novel task to regularize the direction of approach and to eliminate the influences of nearby surfaces. In six participants, we examined speed-accuracy trade-offs for prehension, manipulating the depth (in the plane of the reach), height (orthogonal to the reach), and width (the grasped dimension) of the target object independently. We obtained lawful relationships that were consistent at the group and individual levels. It took longer to reach for more distant objects, and more time was allowed when placing the fingers on a contact surface smaller in either depth or height. More time was taken to grasp wider objects, but only beyond a critical width that varied between individuals. These speed-accuracy trade-offs showed substantial departures from Fitts' law, and were well described by a two-factor model in which reach distance and object size have separate influences on movement duration. We discuss empirical and theoretical reasons for preferring a two-factor model, and we propose that this may represent the most general form of speed-accuracy trade-off, not only for grasping but also for other spatially constrained aiming tasks. (PsycINFO Database Record [Abstract copyright: (c) 2018 APA, all rights reserved).]
Item Type: | Journal Article | ||||||||
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Subjects: | B Philosophy. Psychology. Religion > BF Psychology | ||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Psychology | ||||||||
SWORD Depositor: | Library Publications Router | ||||||||
Library of Congress Subject Headings (LCSH): | Motor ability, Motor ability -- Testing, Movement, Psychology of , Motion perception (Vision), Movement, Aesthetics of | ||||||||
Journal or Publication Title: | Journal of experimental psychology. Human perception and performance | ||||||||
Publisher: | American Psychological Association | ||||||||
ISSN: | 1939-1277 | ||||||||
Official Date: | July 2018 | ||||||||
Dates: |
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Volume: | 44 | ||||||||
Number: | 7 | ||||||||
Page Range: | pp. 1022-1037 | ||||||||
DOI: | 10.1037/xhp0000512 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 20 September 2019 | ||||||||
Date of first compliant Open Access: | 20 September 2019 | ||||||||
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