Movement time for motion-impaired users assisted by force-feedback

effects of movement amplitude, target width, and gravity well width

Faustina Hwang, Simeon Keates, Patrick Langdon, P. John Clarkson

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)85-95
Number of pages11
JournalUniversal Access in the Information Society
Volume4
Issue number2
DOIs
Publication statusPublished - Dec 2005

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abstract = "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.",
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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, Faustina; Keates, Simeon; Langdon, Patrick; Clarkson, P. John.

In: Universal Access in the Information Society, Vol. 4, No. 2, 12.2005, p. 85-95.

Research output: Contribution to journalArticle

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AU - Hwang, Faustina

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AU - Clarkson, P. John

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AB - 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.

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