Roughness perception of virtual textures displayed by electrovibration on touch screens

Yasemin Vardar, Aykut Isleyen, Muhammad K. Saleem, Cagatay Basdogan

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

24 Citations (Scopus)


In this study, we have investigated the human roughness perception of periodical textures on an electrostatic display by conducting psychophysical experiments with 10 subjects. To generate virtual textures, we used low frequency unipolar pulse waves in different waveform (sinusoidal, square, saw-tooth, triangle), and spacing. We modulated these waves with a 3kHz high frequency sinusoidal carrier signal to minimize perceptional differences due to the electrical filtering of human finger and eliminate low-frequency distortions. The subjects were asked to rate 40 different macro textures on a Likert scale of 1-7. We also collected the normal and tangential forces acting on the fingers of subjects during the experiment. The results of our user study showed that subjects perceived the square wave as the roughest while they perceived the other waveforms equally rough. The perceived roughness followed an inverted U-shaped curve as a function of groove width, but the peak point shifted to the left compared to the results of the earlier studies. Moreover, we found that the roughness perception of subjects is best correlated with the rate of change of the contact forces rather than themselves.

Original languageEnglish
Title of host publication2017 IEEE World Haptics Conference, WHC 2017
Number of pages6
ISBN (Electronic)9781509014255
Publication statusPublished - 2017
Externally publishedYes
Event7th IEEE World Haptics Conference, WHC 2017 - Munich, Germany
Duration: 6 Jun 20179 Jun 2017


Conference7th IEEE World Haptics Conference, WHC 2017

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