Investigating selection and reading performance on a mobile phone while walking

ABSTRACT

More and more people interact with their mobile phone while walking. The presented research analyzes; firstly, the negative effect of walking when considering reading and target selection tasks, such as weaker performance and higher workload. Here, we focused on one-handed interaction with a touch screen whereby the thumb is used as the input device. Secondly, we analyze how these negative effects can be compensated by increasing the text size and the size of the targets to select on the mobile phone. A comparative user study was conducted with 16 participants who performed target acquisition and reading tasks while standing and walking. The results show that whilst performance decreases, cognitive load increases significantly when reading and selecting targets when walking. Furthermore, the results show that the negative effect regarding target selection can be compensated by increasing the target size, but the text reading task did not yield better performance results for a larger text size due to the increased demand for scrolling. These results can be used to inform future designs of mobile user interfaces which might provide a dedicated walking mode.

References

1. Apple Inc. iPhone Human Interface Guidelines, 2009.
2. Leon Barnard, Ji Soo Yi, Julie A. Jacko, and Andrew Sears. An empirical comparison of use-in-motion evaluation scenarios for mobile computing devices. International Journal of Human-Computer Studies, 62(4): 487--520, 2005.
3. Iain Darroch, Joy Goodman, Stephen Brewster, and Phil Gray. The effect of age and font size on reading text on handheld computers. In INTERACT 2005, 253--266, 2005.
4. Alan Dix, Janet E. Finlay, Gregory D. Abowd, and Russell Beale. Human-Computer Interaction. Prentice Hall, third edition, December 2003.
5. P. M. Fitts. The information capacity of the human motor system in controlling the amplitude of movement. Journal of Experimental Psychology, 47(6): 381--391, June 1954.
6. James R. Lewis. Literature Review of Touch-Screen Research from 1980 to 1992. IBM Technical Report 54.694, August 1993.
7. International Standard for Organization. ISO 9241-9: Ergonomic requirements for office work with visual display terminals (VDTs) - Part 9: Requirements for non-keyboard input devices, 2000.
8. Shaun K. Kane, Jacob O. Wobbrock, and Ian E. Smith. Getting off the treadmill: Evaluating walking user getting off the treadmill: Evaluating walking user interfaces for mobile devices in public spaces. In MobileHCI '08, pp. 109--118.
9. A. K. Kjeldskov and J. Stage. New techniques for usability evaluation of mobile systems. International Journal of Human-Computer Studies, 60(5-6):599--620, 2004.
10. Learning Express, editor. 501 Reading Comprehension Questions. Learning Express, Third edition, 2006.
11. Min Lin, Rich Goldman, Kathleen J. Price, Andrew Sears, and Julie Jacko. How do people tap when walking? An empirical investigation of nomadic data entry. International Journal of Human-Computer Studies, 65(9):759--769, 2007.
12. I. Scott MacKenzie and William Buxton. Extending fitts' law to two-dimensional tasks. In Proc. CHI '92, pp. 219--226.
13. Sachi Mizobuchi, Mark Chignell, and David Newton. Mobile text entry: relationship between walking speed and text input task difficulty. In Proc. MobileHCI '05, pp 122--128.
14. Terhi Mustonen, Maria Olkkonen, and Jukka Hakkinen. Examining mobile phone text legibility while walking. In CHI '04 extended abstracts, pp. 1243--1246.
15. NASA Ames Research Center, 1987. Manual of NASA Task Load Index (TLX), v. 1.0 Computerized Version.
16. Pekka Parhi, Amy K. Karlson, and Benjamin B. Bederson. Target size study for one-handed thumb use on small touchscreen devices. In Proc. MobileHCI '06, pp. 203--210.
17. Ahmad Rahmati, Clayton Shepard, and Lin Zhong. NoShake: Content stabilization for shaking screens of mobile devices. In Proc. Percom 2009, pp. 1--6.
18. Matt Richtel. Forget gum. Walking and using phone is risky. The New York Times. 17.01.2010
19. Miles A. Tinker. Bases for Effective Reading. University of Minnesota Press, November 1965.
20. Kristin Vadas, Nirmal Patel, Kent Lyons, Thad Starner, and Julie Jacko. Reading on-the-go: a comparison of audio and hand-held displays. In Proc. MobileHCI '06, pp219--226.
21. Daniel Vogel and Patrick Baudisch. Shift: a technique for operating pen-based interfaces using touch. In Proc. CHI '07, pp. 657--666.
22. Williams, E. J. Experimental designs balanced for the estimation of residual effects of treatments. Australian Journal of Scientific Research, Ser. A 2, 1949, pp. 149--168.
23. Koji Yatani, Kurt Partridge, Marshall Bern, and Mark W.Newman. Escape: a target selection technique using visually-cued gestures. In Proc. CHI '08, pp 285--294.

Index Terms

• Human-centered computing

  • Human computer interaction (HCI)

    • Interaction devices

      • Touch screens

  • Interaction design

    • Interaction design process and methods

      • Interface design prototyping