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

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.

Citation

Hwang, F., Keates, S., Langdon, P., & 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, 85-95. https://doi.org/10.1007/S10209-005-0114-5

• Journal Article Type: Article
• Acceptance Date: Sep 6, 2005
• Online Publication Date: Sep 6, 2005
• Publication Date: 2005-12
• Deposit Date: Jan 31, 2019
• Journal: Universal Access in the Information Society
• Print ISSN: 1615-5289
• Electronic ISSN: 1615-5297
• Publisher: BMC
• Peer Reviewed: Peer Reviewed
• Volume: 4
• Pages: 85-95
• DOI: https://doi.org/10.1007/S10209-005-0114-5
• Keywords: movement time, motion impaired users assisted by force-feedback, movement amplitude, target width, gravity well width
• Public URL: http://researchrepository.napier.ac.uk/Output/1497007
• Publisher URL: http://gala.gre.ac.uk/12659/