Two studies were conducted to evaluate the adequacy of identifying the optimum display/control gain for an interface as a method of control-display interface optimization. The first study examined the effects of changes in both the maximum control input and the display width on target acquisition performance with a touch tablet and a trackball. The second study evaluated the effects of changes in the display amplitude, the display target width, and the control amplitude. Results from both studies indicate that gain is an insufficient specification for performance. In addition, the inadequacy of Fitts' Law in this context is discussed.
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References
1.
BuckL. (1980). Motor performance in relation to control-display gain and target width. Ergonomics, 23, 579–589.
2.
FittsP.M. (1954). The information capacity of the human motor system in controlling amplitude of movement. Journal of Experimental Psychology, 47, 381–391.
3.
GibbsC.B. (1962). Controller design: Interactions of controlling limbs, time lags, and gains in positional and velocity systems. Ergonomics, 5, 385–402.
4.
JenkinsW.L.ConnorM.B. (1949). Some design factors in making settings on a linear scale. Journal of Applied Psychology, 33, 395–409.
5.
ParngA.K. (1986, January). An automated test of Fitts' Law and effects of target width and control-display gain using a digitizer tablet. (Technical Report). Vermillion, SD: University of South Dakota, Dept. of Psychology.
