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Manual Tracking in Two Dimensions
Department of Neuroscience, University of Minnesota, Minneapolis, Minnesota 55455 Engel, Kevin C. and John F. Soechting. Manual Tracking in Two Dimensions. J. Neurophysiol. 83: 3483-3496, 2000. Manual tracking was studied by asking subjects to follow, with their finger, a target moving on a touch-se...
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Published in: | Journal of neurophysiology 2000-06, Vol.83 (6), p.3483-3496 |
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Main Authors: | , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Department of Neuroscience, University of Minnesota, Minneapolis,
Minnesota 55455
Engel, Kevin C. and
John F. Soechting.
Manual Tracking in Two Dimensions. J. Neurophysiol. 83: 3483-3496, 2000. Manual tracking was studied
by asking subjects to follow, with their finger, a target moving on a
touch-sensitive video monitor. The target initially moved in a straight
line at a constant speed and then, at a random point in time, made one
abrupt change in direction. The results were approximated with a simple
model according to which, after a reaction time, the hand moved in a
straight line to intercept the target. Both the direction of hand
motion and its peak speed could be predicted by assuming a constant
time to intercept. This simple model was able to account for results obtained over a broad range of target speeds as well as the results of
experiments in which both the speed and the direction of the target
changed simultaneously. The results of an experiment in which the
target acceleration was nonzero suggested that the error signals used
during tracking are related to both speed and direction but poorly (if
at all) to target acceleration. Finally, in an experiment in which
target velocity remained constant along one axis but the perpendicular
component underwent a step change, tracking along both axes was
perturbed. This last finding demonstrates that tracking in two
dimensions cannot be decomposed into its Cartesian components. However,
an analytical model in a hand-centered frame of reference in which
speed and direction are the controlled variables could account for much
of the data. |
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ISSN: | 0022-3077 1522-1598 |
DOI: | 10.1152/jn.2000.83.6.3483 |