Over the past decade, indirect pointing with a mouse has become a fundamental part of the GUI environment. In that regard research has used Fitts' law to measure speed and accuracy of the human-motor system when using input devices. Other studies have found that angle of approach also affects performance. However, most such analyses have not considered control-display gain as a factor. The present study found that gain interacted with angle of approach, amplitude, and target size on movement time. Fitts' law remained an effective predictor of movement time across all conditions; however, less variance was accounted for in the higher control-display gain conditions. Based on these results, recommendations are given for GUI design.
The CombiMouse™ is a new input device for personal computers that combines the functionality of a keyboard and a mouse into one device. The CombiMouse™ consists of two units, much like a split-keyboard, in which the left hand unit (LHU) is a stationary device with keys that are typically used by the left hand, while the right hand unit (RHU) contains keys typically used by the right hand, but is mobile and serves as a mouse. Preliminary results of first-time usage indicate the device to be very promising. Performance was shown to be just as efficient as the traditional mouse and significantly more efficient than the track ball. Typing performance was not as fast as the traditional keyboard; however, the participants showed improvement with more usage of the device.
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