Force fluctuations while pressing and moving against high- and low-friction touch screen surfaces

Experimental Brain Research
Mukta N Joshi, Kevin G Keenan

Abstract

The purpose of this study was to identify the influence of a high- and low-friction surface on the ability to maintain a steady downward force during an index finger pressing and moving task. Fifteen right-handed subjects (24-48 years) performed a static force pressing task and a hybrid pressing and moving task on the surface of an iPad mini while holding a steady 2-N force on high- and low-friction surfaces. Variability of force was quantified as the standard deviation (SD) of normal force (F z) and shear force (F xy) across friction conditions and tasks. The SD of F z was 227 % greater during the hybrid task as compared to the static task (p < .001) and was 19 % greater for the high- versus low-friction condition (p = .033). There were positive correlations between SD of F z and F xy during the hybrid force/motion tasks on the high- and low-friction conditions (r (2) = 0.5 and 0.86, respectively), suggesting significant associations between normal and shear forces for this hybrid task. The correlation between the SD of F z for static and hybrid tasks was r (2) = 0.44, indicating that the common practice of examining the control of static tasks may not sufficiently explain performance during hybrid tasks, at least for the youn...Continue Reading

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Citations

Jan 2, 2018·Royal Society Open Science·Michael G Browne, Jason R Franz
Aug 24, 2017·Australasian Physical & Engineering Sciences in Medicine·Lianrong ZhengGuanzheng Liu
Feb 2, 2018·PloS One·Brittany D Heintz, Kevin G Keenan

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