A1 Journal article (refereed), original research

Wireless Face Interface: Using voluntary gaze direction and facial muscle activations for human-computer interaction

Publication Details

Authors: Tuisku Outi, Surakka Veikko, Vanhala Toni, Rantanen Ville, Lekkala Jukka

Publication year: 2012

Language: English

Related journal or series: Interacting with Computers

Volume number: 24

Issue number: 1

Start page: 1

End page: 9

JUFO level of this publication: 1

Open Access: Not an Open Access publication


The present aim was to investigate the functionality of a new wireless prototype called Face Interface. The prototype combines the use of voluntary gaze direction and facial muscle activations, for pointing and selecting objects on a computer screen, respectively. The subjective and objective functionality of the prototype was evaluated with a series of pointing tasks using either frowning (i.e., frowning technique) or raising the eyebrows (i.e., raising technique) as the selection technique. Pointing task times and accuracies were measured using three target diameters (i.e., 25, 30, 40 mm), seven pointing distances (i.e., 60, 120, 180, 240, 260, 450, and 520 mm), and eight pointing angles (0°, 45°, 90°, 135°, 180°, 225°, 270°, and 315°). The results showed that the raising technique was faster selection technique than the frowning technique for the objects that were presented in the pointing distances from 60 mm to 260 mm. For those pointing distances the overall pointing task times were 2.4 seconds for the frowning technique, and 1.6 seconds for the raising technique. Fitts' law computations showed that the correlations for the Fitts' law model were r = 0.77 for the frowning technique and r = 0.51 for the raising technique. Further, the index of performance (IP) value was 1.9 bits/s for the frowning technique and 5.4 bits/s for raising the eyebrows technique. Based on the results, the prototype functioned well and was adjustable so that two different facial activations can be used in combination with gaze direction for pointing and selecting objects on a computer screen.

Last updated on 2017-22-03 at 13:39