Direction coding using a tactile chair
de Vries, S.C.
van Erp, J.B.F.
TNO Defensie en Veiligheid
This laboratory study examined the possibility of using a car seat instrumented with tactile display elements (tactors) to communicate directional information to a driver. A car seat fitted with an 8 by 8 matrix of tactors embedded in the seat pan was used to code eight different directions.Localization performance (speed and accuracy) was examined as a function of the directional location, presence of a central attention cue, tactile rhythm, stimulus extent, age, and gender. The mean angular localization error was 23°, and both response accuracy and response times were superior for the backward directions. Of the tactile rhythm / attention cue combinations examined, results favored vibration bursts of 125 and 250 ms without a centrally-located attention cue over longer bursts or signals with an attention cue. Observed age and gender effects were relatively modest. In addition, the tactile stimulus was detected by more than 90% of the participants under surprise trial conditions. Overall, these results indicate that the tactile chair provided a promising and robust method of providing directional information.
To reference this document use:
Applied ergonomics, 40 (3), 477-484