|Maya Arlini Puspasari||Department of Indutrial Engineering, Faculty of Engineering, Universitas Indonesia, Kampus Baru UI Depok 16424, Indonesia|
|Yung-Hui Lee||National Taiwan University of Science and Technology 43, Sec. 4, Keelung Rd., 106 Taipei, ROC|
This study investigates the effect of touchpad size, position filter,
and control display gain on user performance. Observations include the
behavior of user while using the touchpad to acquire color-changing
targets. This study examines the effect of two touchpad sizes, which
consist of large (100×60 mm) and small (65×36 mm) sizes, position
filters (30, 50), and control-display gains (0.5, 1, 2) on acquiring
targets that appeared in eight positions (0°, 45°, 90°, 135°, 180°,
225°, 270°, 315°), at three distances (100, 300, 500 pixel) and 3
different levels of target size (10, 40, 70 pixel). As for the results,
touchpad size significantly affects movement time, error count, movement
count, and re-entry count. Position filter also significantly affects
the re-entry count. The different behavior of touchpad user differs
significantly regarding to performance measurements. Filter 50 and Gain 2
for primary movement and Filter 30 and Gain 0.5 for secondary movement
are the best combinations for participants to achieve optimum
performance. Based on Fitts’ Law, the proposed model successfully
predicts movement time by adding the effect of CD gain in formulating
the task’s difficulty index (R² = 0.8147). The results in this study
will be useful for microelectronic companies to increase touchpad
performance and to offer suggestions for designing touchpads based on
optimal settings. Furthermore, this study also reveals that each type of
touchpad features different settings to achieve optimum performance.
Fitts’ Law, Human-computer interaction, Touchpad, Velocity curve
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