Tactile perception by friction induced vibrations

Fagiani, Ramona; Massi, Francesco; Châtelet, Éric; Berthier, Yves; Akay, Adnan

doi:10.1016/j.triboint.2011.03.019

Cited by 131 publications

(115 citation statements)

References 48 publications

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“…Studies with biomimetic devices have led to the proposition that the spatial period of fingerprints would be reflected in the frequency spectrum of vibrations elicited by nonperiodic textures ). However, other studies have suggested that fingerprints merely enhance the magnitude of the elicited vibrations indiscriminately (Oddo et al 2011) or that their frequency composition depends on the ratio between the spatial period of the texture and that of the fingerprints (Fagiani et al 2011(Fagiani et al , 2012.…”

Section: Role Of Fingerprints In Texture Perceptionmentioning

confidence: 98%

Natural scenes in tactile texture

Manfredi

Saal

Brown

et al. 2014

Journal of Neurophysiology

174

153

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Sensory systems are designed to extract behaviorally relevant information from the environment. In seeking to understand a sensory system, it is important to understand the environment within which it operates. In the present study, we seek to characterize the natural scenes of tactile texture perception. During tactile exploration complex high-frequency vibrations are elicited in the fingertip skin, and these vibrations are thought to carry information about the surface texture of manipulated objects. How these texture-elicited vibrations depend on surface microgeometry and on the biomechanical properties of the fingertip skin itself remains to be elucidated. Here we record skin vibrations, using a laser-Doppler vibrometer, as various textured surfaces are scanned across the finger. We find that the frequency composition of elicited vibrations is texture specific and highly repeatable. In fact, textures can be classified with high accuracy on the basis of the vibrations they elicit in the skin. As might be expected, some aspects of surface microgeometry are directly reflected in the skin vibrations. However, texture vibrations are also determined in part by fingerprint geometry. This mechanism enhances textural features that are too small to be resolved spatially, given the limited spatial resolution of the neural signal. We conclude that it is impossible to understand the neural basis of texture perception without first characterizing the skin vibrations that drive neural responses, given the complex dependence of skin vibrations on both surface microgeometry and fingertip biomechanics.

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Section: Role Of Fingerprints In Texture Perceptionmentioning

confidence: 98%

Natural scenes in tactile texture

Manfredi

Saal

Brown

et al. 2014

Journal of Neurophysiology

174

153

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“…The relation between finger ridges, vibrations, friction and surface texture is subject of research in Refs. [13,14], yet a straightforward translation to comfort during use [15] or an application to for example touch perception of robotic fingers is at the very beginning of development [9].…”

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confidence: 99%

Skin tribology: Science friction?

2013

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Abstract:The application of tribological knowledge is not just restricted to optimizing mechanical and chemical engineering problems. In fact, effective solutions to friction and wear related questions can be found in our everyday life. An important part is related to skin tribology, as the human skin is frequently one of the interacting surfaces in relative motion. People seem to solve these problems related to skin friction based upon a trial-anderror strategy and based upon on our sense for touch. The question of course rises whether or not a trained tribologist would make different choices based upon a science based strategy? In other words: Is skin friction part of the larger knowledge base that has been generated during the last decades by tribology research groups and which could be referred to as Science Friction? This paper discusses the specific nature of tribological systems that include the human skin and argues that the living nature of skin limits the use of conventional methods. Skin tribology requires in vivo, subject and anatomical location specific test methods. Current predictive friction models can only partially be applied to predict in vivo skin friction. The reason for this is found in limited understanding of the contact mechanics at the asperity level of product-skin interactions. A recently developed model gives the building blocks for enhanced understanding of friction at the micro scale. Only largely simplified power law based equations are currently available as general engineering tools. Finally, the need for friction control is illustrated by elaborating on the role of skin friction on discomfort and comfort. Surface texturing and polymer brush coatings are promising directions as they provide way and means to tailor friction in sliding contacts without the need of major changes to the product.Keywords: friction; bio-tribology; skin; soft tissue; surface texture; brush coatings Skin friction in daily lifeThe application of tribological knowledge, i.e., knowledge on the science and technology of interacting surfaces in relative motion, is not restricted to optimizing mechanical and chemical engineering problems. In fact, effective solutions to tribology related questions are evident in our everyday life, as illustrated in fascinating examples described by D. Dowson's "A tribological day" [1]. An important part of the effective solutions in daily life situations is related to skin tribology, as the human skin is frequently one of the interacting surfaces in relative motion. These questions are typically related to optimizing friction and lubrication problems in skin-product interactions, rather than to optimising wear. Take for example the swimming pool or bathroom where material selection and application of anti-slip coatings prevent us from falling when the floor gets wet. Yet, if such coatings do not sufficiently increase friction, one will optimize the tribological system, e.g., by pressing our full foot to the floor and subsequently increasing the true area of contact or by chan...

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“…The equation of motion is then given as where ẋ r (t) =ẋ p (t) −ẋ c (t) and f r (t) are the relative velocity between the finger pad and contactor and the friction force, respectively. The motion of the contactor was determined by a sinusoidal function (1). Because the human hand force is regarded as being large enough to maintain the intended motion, the motion of the finger is given by ẋ f (t) = constant, and ẍ f (t) = 0.…”

Section: Physical Modelmentioning

confidence: 99%

“…The roughness and friction perceptions influence each other [1,48,49]. In the case of materials with microscopic surface roughness, any relative motion between the finger and material give rise to the perception of roughness [50][51][52].…”

Section: Conditions Causing Lateral Vibration To Increase Friction Pementioning

confidence: 99%

“…Especially, previous research intensively studied the roles of frictional vibration in the textural perception of materials when a finger is slid over a material surface [1][2][3][4][5][6]. For example, Fagiani [1] investigated the spectra of frictional vibrations where a finer surface roughness and higher sliding velocity led to higher frequency components in the spectra. Nonomura et al [2] suggested that humans may discern different types of liquids based on the stick-slip phenomenon when they investigate fluids on flat glass.…”

Section: Introductionmentioning

confidence: 99%

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Friction perception resulting from laterally vibrotactile stimuli

2017

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When a human rubs a contactor that is vibrating laterally at 3-10 Hz with an amplitude of ~1 mm, the friction is perceived as being greater than that sensed when touching a stationary contactor. This phenomenon could be exploited for a new vibrotactile approach to friction perception; however, the principles behind it have yet to be explained. In this study, we hypothesized that the perceived friction increases because of the Stribeck characteristic and stick-slip phenomenon of friction, whereby the friction varies depending on the relative velocity between a subject's fingertip and contactor. The relative velocity instantaneously decreases because of the lateral vibration of the contactor, while the friction rises during the same period. To test this hypothesis, we simulated the friction forces between a fingertip and a vibrating contactor. Furthermore, we performed psychophysical experiments using five participants, in which each explored a vibrating contactor and subjectively compared the perceived friction under several stimulus conditions. The simulated friction forces, the results of the psychophysical experiments, and physical observation suggested that the transient increases in friction caused by lateral vibration of the contactor influenced friction perception for a laterally vibrating contactor.

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Tactile perception by friction induced vibrations

Cited by 131 publications

References 48 publications

Natural scenes in tactile texture

Natural scenes in tactile texture

Skin tribology: Science friction?

Friction perception resulting from laterally vibrotactile stimuli

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