Book ChapterDOI
Modeling of Human Hand Force Based Tasks Using Fitts's Law
M. S. Raghu Prasad,Sunny Purswani,M. Manivannan +2 more
- pp 377-386
TLDR
In this article, a force-variation based human performance task involving right index finger was performed and it was found that the relationship between movement time and index of difficulty for force tasks are well described by Fitts's law in visual guided, force-based virtual movement task.Abstract:
Conventional Fitts’s model for human movement task finds a common application in modern day interactive computer systems and ergonomics design. According to Fitts’s law the time required to rapidly move to a target area is a function of the distance to the target and the size of the target. This paper describes experimental process for prediction of minimum movement time, in a force-variation based human performance task involving right index finger. In this study we have made an attempt to extend the applicability of the conventional Fitts’s model for a force based virtual movement task, without taking position into account and evaluate human performance metrics for such tasks. An experiment was conducted in which 6 healthy young adult subject’s in the age group of 22–30 years performed force based movement tasks. During each trial, subjects were asked to reach an initial force bar of given thickness W Newtons, corresponding to allowable tolerance. Once the subject’s had reached initial level, they were instructed to reach out the target force bar of same thickness W as quickly as possible and bring it back to the initial force level bar, thereby completing 1 iteration. Time required for 10 such iteration was noted for each subject. The results from the experiment show that the relationship between movement time and index of difficulty for force tasks are well described by Fitts’s law in visual guided, force-based virtual movement task.read more
Citations
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Proceedings ArticleDOI
What is a device bend gesture really good for
TL;DR: It is concluded that device bend gestures use their full potential when used to control continuous bipolar parameters, and when quick reactions are needed.
Journal ArticleDOI
Speed-accuracy tradeoff of fingertip force control with visual/audio/haptic feedback
TL;DR: Human capabilities for controlling absolute magnitudes of fingertip force with discrete visual/audio/haptic feedback cues were observed and compared and showed that the response time obeyed Fitts’ law within a certain range of force accuracy in all the three feedback modes.
Proceedings ArticleDOI
Speed-accuracy tradeoff of controlling absolute magnitude of fingertip force
TL;DR: Experimental data showed that the applied fingertip force obeyed Fitts' law under both visual and auditory feedback modes when the index of difficulty (ID) was smaller than a threshold.
Book ChapterDOI
Effect of Control Movement Scale on Visual Haptic Interactions
TL;DR: It was found that the performance of the participants increases with the scale and has an optimum scale at 1:3.3 before reducing rapidly, which is better than natural movements in tasks which require extended accuracy.
Proceedings ArticleDOI
Quantifying differences between five fingers in speed-accuracy tradeoff for force control tasks
TL;DR: The quantifiable differences of the index of performance (IP) among individual fingers were obtained, which may provide a guideline for design of manipulation products or tasks requiring fast and accurate force control using different fingers.
References
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Proceedings ArticleDOI
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Proceedings ArticleDOI
More than dotting the i's --- foundations for crossing-based interfaces
Johnny Accot,Shumin Zhai +1 more
TL;DR: This paper systematically evaluates two target-pointing tasks and four goal-crossing tasks, which differ by the direction of the movement variability constraint (collinear vs. orthogonal) and by the nature of the action (pointing vs. crossing, discrete vs. continuous).