Relation between human perceived friction and finger friction characteristics

Messaoud, Wael Ben; Bueno, Marie-Ange; Lemaire‐Semail, Betty

doi:10.1016/j.triboint.2016.02.031

Cited by 45 publications

(42 citation statements)

References 32 publications

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“…Although, the earlier studies have investigated the contact mechanics of friction [5], [10]- [17] and our perceptual ability to discriminate two different surfaces based on friction [18]- [20], the number of studies investigating the intermittent contact mechanics during a change in friction on a touch surface is very limited [21]- [24]. Furthermore, the factors affecting our tactile perception of this change have not been investigated in depth yet [22]- [26].…”

Section: Introductionmentioning

confidence: 99%

Tactile Perception of Virtual Edges and Gratings Displayed by Friction Modulation via Ultrasonic Actuation

Saleem

Yılmaz

Başdoğan

2020

IEEE Trans. Haptics

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To render tactile cues on a touchscreen by friction modulation, it is important to understand how human perceive a change in friction. In this study, we investigate the relations between perceived change in friction on an ultrasonically actuated touchscreen and parameters involved in contact between finger and its surface. We first estimate the perceptual thresholds to detect rising and falling friction while finger is sliding on the touch surface. Then, we conduct intensity scaling experiments and investigate the effect of finger sliding velocity, normal force, and rise/fall time of vibration amplitude (transition time) on the perceived intensity of change in friction. In order to better understand the role of contact mechanics, we also look into the correlations between the perceived intensities of subjects and several parameters involved in contact. The results of our experiments show that the contrast and rate of change in tangential force were best correlated with the perceived intensity. The subjects perceived rising friction more strongly than falling friction, particularly at higher tangential force contrast. We argue that this is due to hysteresis and viscoelastic behavior of fingertip under tangential loading. The results also showed that transition time and normal force have significant effect on our tactile perception.

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Section: Introductionmentioning

confidence: 99%

Tactile Perception of Virtual Edges and Gratings Displayed by Friction Modulation via Ultrasonic Actuation

Saleem

Yılmaz

Başdoğan

2020

IEEE Trans. Haptics

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“…Our measurements of the contact forces showed that the exploratory speed conditions had a major influence on the frictional dynamics induced by the square ultrasonic stimulations. A recent study showed a higher frictional contract for very slow exploration (0.5 cm/s) compared to a 2 cm/s speed [11] in passive touch conditions. Our results show indeed a strong correlation between the reduction of friction and the speed of exploration for the first of the two square stimulations but no such correlation is observed for the second one.…”

Section: Discussionmentioning

confidence: 93%

“…Until recently, studies were primarily focusing on the threshold for perceiving the changes in the intensity of the frictional force induced by either ultrasonic lubrication [9]- [11] or electrovibration [12]. However, the frictional gradient of friction-based textures is perceptually salient [13] and the rate of change in the lateral force has been shown to affect the perceived intensity of periodic modulations of friction with the same amplitude [14] as well as the perceptual threshold for rising and falling frictional steps [15].…”

Section: Introductionmentioning

confidence: 99%

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The Perception of Ultrasonic Square Reductions of Friction With Variable Sharpness and Duration

Gueorguiev

Vezzoli

Sednaoui

et al. 2019

IEEE Trans. Haptics

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The human perception of square ultrasonic modulation of the finger-surface friction was investigated during active tactile exploration by using short frictional cues of varying duration and sharpness. In a first experiment, we asked participants to discriminate the transition time and duration of short square ultrasonic reductions of friction. They proved very sensitive to discriminate millisecond differences in these two parameters with the average psychophysical thresholds being 2.3-2.4 ms for both parameters. A second experiment focused on the perception of square friction reductions with variable transition times and durations. We found that for durations of the stimulation larger than 90 ms, participants often perceived three or four edges when only two stimulations were presented while they consistently felt two edges for signals shorter than 50 ms. A subsequent analysis of the contact forces induced by these ultrasonic stimulations during slow and fast active exploration showed that two identical consecutive ultrasonic pulses can induce significantly different frictional dynamics especially during fast motion of the finger. These results confirm the human sensitivity to transient frictional cues and suggest that the human perception of square reductions of friction can depend on their sharpness and duration as well as on the speed of exploration.

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“…For example, the surface of a screen or a cup can sometimes feel sticky and sometimes not. During dynamic touch, the stickiness of a surface is commonly related to the finger-surface friction and can depend on the touched material (Bensmaïa and Hollins, 2005), the characteristics of the fingerpad (Dinç et al, 1991;Cornuault et al, 2015), and exploratory parameters, such as the sliding velocity and the contact force (Tang et al, 2015a;Ben Messaoud et al, 2016). However, the stickiness of a material can also be felt during static touch, probably through adhesion and micro-stretching of the skin (Bergmann Tiest, 2010).…”

Section: Introductionmentioning

confidence: 99%

Physical Variables Underlying Tactile Stickiness During Fingerpad Detachment

et al. 2020

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One may notice a relatively wide range of tactile sensations even when touching the same hard, flat surface in similar ways. Little is known about the reasons for this variability, so we decided to investigate how the perceptual intensity of light stickiness relates to the physical interaction between the skin and the surface. We conducted a psychophysical experiment in which nine participants actively pressed their finger on a flat glass plate with a normal force close to 1.5 N and detached it after a few seconds. A custom-designed apparatus recorded the contact force vector and the finger contact area during each interaction as well as pre-and post-trial finger moisture. After detaching their finger, participants judged the stickiness of the glass using a nine-point scale. We explored how sixteen physical variables derived from the recorded data correlate with each other and with the stickiness judgments of each participant. These analyses indicate that stickiness perception mainly depends on the pre-detachment pressing duration, the time taken for the finger to detach, and the impulse in the normal direction after the normal force changes sign; finger-surface adhesion seems to build with pressing time, causing a larger normal impulse during detachment and thus a more intense stickiness sensation. We additionally found a strong between-subjects correlation between maximum real contact area and peak pull-off force, as well as between finger moisture and impulse.

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Relation between human perceived friction and finger friction characteristics

Cited by 45 publications

References 32 publications

Tactile Perception of Virtual Edges and Gratings Displayed by Friction Modulation via Ultrasonic Actuation

Tactile Perception of Virtual Edges and Gratings Displayed by Friction Modulation via Ultrasonic Actuation

The Perception of Ultrasonic Square Reductions of Friction With Variable Sharpness and Duration

Physical Variables Underlying Tactile Stickiness During Fingerpad Detachment

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