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Gain effects on performance using a head-controlled computer input device.

M L Lin1, R G Radwin, G C Vanderheiden

  • 1Department of Industrial Engineering, University of Wisconsin-Madison 53706.

Ergonomics
|February 1, 1992
PubMed
Summary
This summary is machine-generated.

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Control-display gain significantly impacts head-controlled and hand-controlled pointing device performance. Optimal gain settings differ, with head control requiring lower gain for efficient computer input.

Area of Science:

  • Human-Computer Interaction
  • Usability Engineering
  • Ergonomics

Background:

  • Control-display gain is a critical parameter influencing the performance of computer input devices.
  • Understanding optimal gain is essential for designing efficient and user-friendly interfaces, particularly for novel input methods like head control.

Purpose of the Study:

  • To evaluate the effect of control-display gain on performance with a head-controlled computer input device.
  • To compare gain sensitivity and optimal gain between head and hand/arm control systems.
  • To investigate interactions between control-display gain and task factors (target width, movement amplitude, direction).

Main Methods:

  • A Fitts' task was employed for discrete target acquisition using varying target sizes (2.9-23.5 mm) and movement amplitudes (24.3-61.7 mm).

Related Experiment Videos

  • Both head-controlled and hand/arm (mouse) control devices were tested at four different gain levels.
  • Ten subjects participated in the study, with performance metrics including movement time and root mean square (RMS) cursor deviation.

    • Main Results:

    • Control-display gain significantly affected movement time for both head and mouse control, with identifiable optimal gain ranges.
    • Optimal mouse gain for minimal movement time and RMS deviation was between 1.0 and 2.0; for head control, it was between 0.3 and 0.6.
    • Head control exhibited higher movement time (76% greater) and RMS displacement (27% greater) at optimal gains compared to mouse control. Gain had a more pronounced effect on head control with smaller targets and longer movement amplitudes.

    Conclusions:

    • Fitts' Law accurately describes discrete target acquisition performance for both head and mouse control across various gains.
    • Head-controlled systems require significantly lower optimal gain settings than traditional mouse controls for comparable performance.
    • Control-display gain is a crucial factor, especially for head control, interacting significantly with target size and movement amplitude to affect user performance.