Abstract
We present a two-dimensional (2D) pointing technique for motor-impaired users who generally use single-input switch. The technique, called TBS\(^3\) for “two-bar single-switch scanning”, uses two bars and proceeds in two steps: moving a vertical bar then moving a horizontal bar. The user starts and stops each bar by activating the single input switch. Selection is made at the intersection of the two bars when the horizontal bar is stopped by the user. We present two variations of the technique. In the first (“one-way”), the bars move only in one direction, and return to their origin after each selection. In the second (“button”), the user controls the direction by a selecting an on-screen soft button before bar movements starts. The techniques were evaluated in a experiment with twelve participants using the 2D target-selection task described in ISO 9241-411. Due to the two-stage pointing process, the task was inherently slow with a mean movement time of 8.4 s per trial. The mean error rate was just under 10% with the one-way method (8.0%) more accurate than the button method (11.1%). Throughput was 0.31 bps overall with values of 0.26 bps for the one-way method and 0.36 bps for the button method.
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References
Felzer, T., MacKenzie, I.S., Magee, J.: Comparison of two methods to control the mouse using a keypad. In: Miesenberger, K., Bühler, C., Penaz, P. (eds.) ICCHP 2016. LNCS, vol. 9759, pp. 511–518. Springer, Cham (2016). https://doi.org/10.1007/978-3-319-41267-2_72
Hassan, M., Magee, J., MacKenzie, I.S.: A Fitts’ law evaluation of hands-free and hands-on input on a laptop computer. In: Antona, M., Stephanidis, C. (eds.) HCII 2019. LNCS, vol. 11573, pp. 234–249. Springer, Cham (2019). https://doi.org/10.1007/978-3-030-23563-5_20
ISO: Evaluation methods for the design of physical input devices - ISO/TC 9241–411: 2012(E). Report Report Number ISO/TS 9241–411:2102(E), International Organisation for Standardisation (2012)
Magee, J., Felzer, T., MacKenzie, I.S.: Camera Mouse + ClickerAID: dwell vs. single-muscle click actuation in mouse-replacement interfaces. In: Antona, M., Stephanidis, C. (eds.) UAHCI 2015. LNCS, vol. 9175, pp. 74–84. Springer, Cham (2015). https://doi.org/10.1007/978-3-319-20678-3_8
Perez-Maldonado, C., Wexler, A.S., Joshi, S.S.: Two-dimensional cursor-to-target control from single muscle site sEMG signals. IEEE Trans. Neural Syst. Rehabil. Eng. 18(2), 203–209 (2010)
Pinheiro, C.G., Naves, E.L., Pino, P., Losson, E., Andrade, A.O., Bourhis, G.: Alternative communication systems for people with severe motor disabilities: a survey. Biomed. Eng. Online 10(1), 1–28 (2011)
Raynal, M., Gauffre, G., Bach, C., Schmitt, B., Dubois, E.: Tactile camera vs. tangible camera: taking advantage of small physical artefacts to navigate into large data collection. In: Proceedings of NordiCHI 2010, pp. 373–382. ACM, New York (2010)
Rodrigues, A.S., da Costa, V.K., Cardoso, R.C., Machado, M.B., Machado, M.B., Tavares, T.A.: Evaluation of a head-tracking pointing device for users with motor disabilities. In: Proceedings of PETRA 2017, pp. 156–162. ACM, New York (2017)
Soukoreff, R.W., MacKenzie, I.S.: Towards a standard for pointing device evaluation, perspectives on 27 years of Fitts’ law research in HCI. Int. J. Hum. Comput. Stud. 61(6), 751–789 (2004)
Zhang, X., MacKenzie, I.S.: Evaluating eye tracking with ISO 9241 - Part 9. In: Jacko, J.A. (ed.) HCI 2007. LNCS, vol. 4552, pp. 779–788. Springer, Heidelberg (2007). https://doi.org/10.1007/978-3-540-73110-8_85
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Raynal, M., MacKenzie, I.S. (2022). TBS\(^3\): Two-Bar Single-Switch Scanning for Target Selection. In: Miesenberger, K., Kouroupetroglou, G., Mavrou, K., Manduchi, R., Covarrubias Rodriguez, M., Penáz, P. (eds) Computers Helping People with Special Needs. ICCHP-AAATE 2022. Lecture Notes in Computer Science, vol 13341. Springer, Cham. https://doi.org/10.1007/978-3-031-08648-9_39
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DOI: https://doi.org/10.1007/978-3-031-08648-9_39
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