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Type: Journal article
Title: Visual information throughout a reach determines endpoint precision
Author: Ma-Wyatt, A.
McKee, S.
Citation: Experimental Brain Research, 2007; 179(1):55-64
Publisher: Springer
Issue Date: 2007
ISSN: 0014-4819
Statement of
Reaching; Visual feedback; Perturbation; Motor control; Psychophysics
Abstract: People make rapid, goal-directed movements to interact with their environment. Because these movements have consequences, it is important to be able to control them with a high level of precision and accuracy. Our hypothesis is that vision guides rapid hand movements, thereby enhancing their accuracy and precision. To test this idea, we asked observers to point to a briefly presented target (110 ms). We measured the impact of visual information on endpoint precision by using a shutter to close off view of the hand 50, 110 and 250 ms into the reach. We found that precision was degraded if the view of the hand was restricted at any time during the reach, despite the fact that the target disappeared long before the reach was completed. We therefore conclude that vision keeps the hand on the planned trajectory. We then investigated the effects of a perturbation of target position during the reach. For these experiments, the target remained visible until the reach was completed. The target position was shifted at 110, 180 or 250 ms into the reach. Early shifts in target position were easily compensated for, but late shifts led to a shift in the mean position of the endpoints; observers pointed to the center of the two locations, as a kind of best bet on the position of the target. Visual information is used to guide the hand throughout a reach and has a significant impact on endpoint precision
Keywords: Arm; Central Nervous System; Humans; Photic Stimulation; Orientation; Cues; Space Perception; Visual Perception; Psychomotor Performance; Reaction Time; Neuropsychological Tests; Movement; Feedback
RMID: 0020061652
DOI: 10.1007/s00221-006-0767-1
Published version:
Appears in Collections:Psychology publications

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