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Effects of input device and motion type on a cursor-positioning task.

Yi-Jan Yau1, Sheue-Ling Hwang, Chin-Jung Chao

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Summary

This study compared non-keyboard input devices under various motion types. Results show motion significantly impacts speed and accuracy, with trackballs generally outperforming touch screens in dynamic environments.

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Area of Science:

  • Human-Computer Interaction
  • Ergonomics
  • Usability Engineering

Background:

  • Limited research exists on non-keyboard input device performance under dynamic motion conditions.
  • Understanding device interaction during movement is crucial for various applications, including aviation and maritime operations.

Purpose of the Study:

  • To compare the performance of four non-keyboard input devices (three trackballs and a touch screen) under static and dynamic motion conditions.
  • To evaluate the effects of different motion types (heave, roll, pitch, random) on user speed and accuracy.
  • To identify the most efficient input devices for use in motion environments.

Main Methods:

  • Twelve male participants performed tasks using a currently used trackball, a trackman wheel, an erectly held trackball, and a touch screen.
  • Device performance was assessed under five motion conditions: static, heave, roll, pitch, and random movements.
  • Key metrics included movement speed and accuracy, with objective and subjective evaluations.

Main Results:

  • Both input device type and motion type significantly influenced movement speed and accuracy.
  • The touch screen offered the highest speed but lowest accuracy, while the erectly held trackball was slowest.
  • The currently used trackball exhibited the lowest error rate.
  • Random motion had the most significant negative impact on movement time and error rate.

Conclusions:

  • Input device selection is critical for performance in motion environments.
  • Trackball devices, particularly the trackman wheel and currently used trackball, demonstrated superior efficiency and accuracy compared to the touch screen and erectly held trackball under motion.
  • Design considerations for input devices should account for the type and severity of motion experienced by users.