Electrostatic modulated friction as tactile feedback: intensity perception

Authors:
Dinesh Wijekoon;Marta E. Cecchinato;Eve Hoggan;Jukka Linjama
Affiliations:
Helsinki Institute for Information Technology (HIIT), Department of Computer Science, University of Helsinki, Finland;Department of General Psychology, Università degli Studi di Padova, Italy;Helsinki Institute for Information Technology (HIIT), Department of Computer Science, University of Helsinki, Finland;Senseg Ltd, Helsinki, Finland
Venue:
EuroHaptics'12 Proceedings of the 2012 international conference on Haptics: perception, devices, mobility, and communication - Volume Part I
Year:
2012

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Abstract

We describe the preliminary results from an experiment investigating the perceived intensity of modulated friction created by electrostatic force, or electrovibration. A prototype experimental system was created to evaluate user perception of sinusoidal electrovibration stimuli on a flat surface emulating a touch screen interface. We introduce a fixed 6-point Effect Strength Subjective Index (ESSI) as a measure of generic sensation intensity, and compare it with an open magnitude scale. The results of the experiment indicate that there are significant correlations between intensity perception and signal amplitude, and the highest sensitivity was found at a frequency of 80 Hz. The subjective results show that the users perceived the electrovibration stimuli as pleasant and a useful means of feedback for touchscreens.