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Movement time for motion-impaired users assisted by force-feedback: effects of movement amplitude, target width and gravity well width

Hwang, F., Keates, S., Langdon, P. and Clarkson, P.J. (2005) Movement time for motion-impaired users assisted by force-feedback: effects of movement amplitude, target width and gravity well width. Universal Access in the Information Society, 4 (2). 85 - 95.

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To link to this item DOI: 10.1007/s10209-005-0114-5

Abstract/Summary

This paper presents a study investigating how the performance of motion-impaired computer users in point and click tasks varies with target distance (A), target width (W), and force-feedback gravity well width (GWW). Six motion-impaired users performed point and click tasks across a range of values for A, W, and GWW. Times were observed to increase with A, and to decrease with W. Times also improved with GWW, and, with the addition of a gravity well, a greater improvement was observed for smaller targets than for bigger ones. It was found that Fitts Law gave a good description of behaviour for each value of GWW, and that gravity wells reduced the effect of task difficulty on performance. A model based on Fitts Law is proposed, which incorporates the effect of GWW on movement time. The model accounts for 88.8% of the variance in the observed data.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Biological Sciences > Department of Bio-Engineering
ID Code:15292
Uncontrolled Keywords:Fitts Law - Motion-impaired - Force-feedback - Haptic

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