Development and evaluation of multidimensional tactons for a wearable tactile display

ABSTRACT

We developed a novel wearable tactile display system as an alternative to the visual and audio displays routinely used by anesthesiologists to monitor patients in the operating room (OR). Visual displays and auditory alarms can be distracting or insufficient in their alarm transmission whereas a tactile display, which utilizes the sense of touch, can act as an effective conduit for alert delivery. A sophisticated alarm scheme is essential to convey the complex array of physiological information available in current monitoring systems; therefore, to report all relevant alerts to the attending anesthesiologist, it is essential that an augmenting or replacement display system be at least as effective and efficacious as conventional systems. Using multidimensional Tactons, we designed a tactile alert scheme consisting of 36 unique stimuli and evaluated the accuracy and response time in stimuli recognition using a tactile prototype worn as a belt. We observed an overall accuracy of 81% and a response time of 4.8 seconds. 4.18 bits (18.07 tokens) of messages were successfully communicated without loss of information. These results demonstrate that the novel tactile display represents an effective and potentially work-load-reducing method to convey vital information non-visually and non-aurally.

References

1. S. Brewster and L. M. Brown. Tactons: structured tactile messages for non-visual information display. In AUIC '04: Proceedings of the fifth conference on Australasian user interface, pages 15--23, Darlinghurst, Australia, 2004. Australian Computer Society, Inc.
2. L. M. Brown, S. A. Brewster, and H. C. Purchase. A first investigation into the effectiveness of tactons. In WHC 2005, pages 167--176, 2005.
3. L. M. Brown, S. A. Brewster, and H. C. Purchase. Multidimensional tactons for non-visual information presentation in mobile devices. In MobileHCI '06, pages 231--238, New York, NY, USA, 2006. ACM Press.
4. R. Cholewiak and A. Collins. Vibrotactile localization on the arm: Effects of place, space and age. 65(7):1058--1077, 2003.
5. E. Coiera, V. Tombs, and T. Clutton-Brock. Attentional overload as a fundamental cause of human error in monitoring. Technical report, Hewlett Packard Laboratories Technical Report, 1996.
6. S. Ford, J. Daniels, J. Lim, V. Koval, S. K. Schwarz, G. Dumont, and M. J. Ansermino. Touch your patient - a human simulation centre based assessment of a novel vibrotactile display. In Society for Technology in Anesthesia, 2007.
7. J. Y. C. Ng, J. C. F. Man, S. Fels, G. Dumont, and J. M. Ansermino. An evaluation of a vibro-tactile display prototype for physiological monitoring. Anesth Analg, 101(6):1719--1724, Dec 2005.
8. A. Stölle, R. Hözl, D. Kleinböl, A. Mrsic, and H. Tan. Measuring poing localization errors in spatiotemporal tactile stimulus patterns. In EuroHaptics, pages 512--515, 2004.
9. H. Z. Tan, N. I. Durlach, C. M. Reed, and W. M. Rabinowitz. Information transmission with a multifinger tactual display. Percept Psychophys, 61(6):993--1008, Aug 1999.

Index Terms

• Human-centered computing

  • Human computer interaction (HCI)