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Dual-Thumb pointing and command selection techniques for tablets

Published: 17 April 2024 Publication History

Highlights

An optimal Dual-Thumb technique outperforms Single-Thumb pointing techniques.
Similar usage of both thumbs improves the pointing efficiency.
Relative pointing for the coarse step improves the efficiency.
Two thumbs are better than one for menu item selection.
Quarter menu shape is more efficient than Half or Linear menu shape.
Quarter and Half menu techniques favour scalability.
Quarter menu is more efficient than dual-thumb Marking-Menus.

Abstract

Tablets are often used as a distant input device to interact with large displays. Users can hold the tablet with two hands when interacting for a long time to avoid fatigue or dropping it. Still, most previous distant interaction techniques consider only one-handed tablets. This paper presents novel interaction techniques to perform distant pointing and command selection tasks using both thumbs while holding the device with two hands. In a first step, we design and evaluate six interaction techniques for distant pointing, based on using one or two thumbs, absolute or relative cursor control and single- or dual-precision pointing. Our results show that a combination of dual-thumb and relative pointing is preferred and more efficient than any other dual-thumb or single-thumb technique we designed. In a second step, we focus on command selection using two thumbs. We designed seven dual-thumb menu techniques based on quarter-pie or half-pie layouts, offering from 64 to 900 items. Our results show that using quarter-pie menu techniques is more efficient, usable and appreciated than using a linear or half-pie menu. Furthermore, we show that augmenting the number of items for quarter-pie and half-pie menu techniques has a low impact on command selection performance. In a third step, we compare our quarter-pie menus to bimanual marking menus. Our results show that quarter-pie menus are more efficient and less error-prone. We finally provide a set of lessons for designing efficient dual-thumb interaction techniques for two-handed tablets.

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cover image International Journal of Human-Computer Studies
International Journal of Human-Computer Studies  Volume 184, Issue C
Apr 2024
184 pages

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Academic Press, Inc.

United States

Publication History

Published: 17 April 2024

Author Tags

  1. Dual-thumb input
  2. Tablet-based interaction
  3. Pointing
  4. Command selection

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