On the 1/f noise and non-integer harmonic decay of the interaction of a finger sliding on flat and sinusoidal surfaces

Wiertlewski, Michaël; Hudin, Charles; Hayward, Vincent

doi:10.1109/whc.2011.5945456

Cited by 56 publications

(32 citation statements)

References 26 publications

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“…1 and caption. The transformation from geometry to signal is highly nonlinear, a fact that is hardly surprising considering that friction is the primary phenomenon involved [32]. Figure 1.…”

Section: Design Motivation For a Texture Transducermentioning

confidence: 99%

The Spatial Spectrum of Tangential Skin Displacement Can Encode Tactual Texture

2011

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Abstract-The tactual scanning of five naturalistic textures was recorded with an apparatus capable of measuring the tangential interaction force with a high degree of temporal and spatial resolution. The resulting signal showed that the transformation from the geometry of a surface to the force of traction, and hence to the skin deformation experienced by a finger is a highly nonlinear process. Participants were asked to identify simulated textures reproduced by stimulating their fingers with rapid, imposed lateral skin displacements as a function of net position. They performed the identification task with a high degree of success, yet not perfectly. The fact that the experimental conditions eliminated many aspects of the interaction, including low-frequency finger deformation, distributed information, as well as normal skin movements, shows that the nervous system is able to rely on only two cues: amplitude and spectral information. The examination of the "spatial spectrograms" of the imposed lateral skin displacement revealed that texture could be represented spatially despite being sensed through time and that these spectrograms were distinctively organized into what could be called "spatial formants". This finding led us to speculate that the mechanical properties of the finger enables spatial information to be used for perceptual purposes in humans without any distributed sensing, a principle that could be applied to robots.

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Section: Design Motivation For a Texture Transducermentioning

confidence: 99%

The Spatial Spectrum of Tangential Skin Displacement Can Encode Tactual Texture

2011

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“…The subjects compared the effect of a stimulus of type 'sine' with the effect of a stimulus of type 'random', 'chirp', or 'still', and a stimulus of type 'random' with the three other possibilities. The stimuli of type 'sine' and 'random' were selected to serve as reference in two-alternatives comparisons because sinusoidal vibrations are the most common types of vibrations used in experimental studies and pink noise vibrations occur frequently in real world physical interactions [25]. The stimulus with no vibration was not used as a references since it would be possible for the subjects to subjects be biased simply by the sudden occurrence of a vibration.…”

Section: Experimental Procedures and Protocolmentioning

confidence: 99%

Vibrotactile inputs to the feet can modulate vection

Farkhatdinov

Ouarti

Hayward

2013

2013 World Haptics Conference (WHC)

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Vection refers to the illusion of self-motion when a significant portion of the visual field is stimulated by visual flow, while body is still. Vection is known to be strong for peripheral vision stimulation and relatively weak for central vision. In this paper, the results of an experimental study of central linear vection with and without vibrotactile feet stimulation are presented. Three types of vibratory stimuli were used: a sinusoidal signal, pink noise, and a chirp signal. Six subjects faced a screen looking at a looming visual flow that suggested virtual forward motion. The results showed that the sensation of self-motion happened faster and its intensity was the strongest for sinusoidal vibrations at constant frequency. For some subjects, a vibrotactile stimulus with an increasing frequency (a chirp) elicited as well a stronger vection. The strength of sensation of self-motion was the lowest in the cases when pink noise vibrations and no vibrotactile stimulation accompanied the visual flow stimulation. Possible application areas are mentioned.

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“…Stratum Corneum: The external skin layer, the stratum corneum, is made of keratin, which is a structural material arising from the death of skin cells. This material is mechanically akin to a polymer [61] and is capable of creating complex mechanical effect during sliding, even on optically smooth surfaces [16,19,83]. Sweat Glands: While the volar regions of the body cover only 5% of its surface, 25% of all the 2 millions sweat glands are located there with a density reaching 300 per cm 2 [57,73].…”

Section: The Volar Handmentioning

confidence: 99%

A Brief Overview of the Human Somatosensory System

Hayward

2018

Springer Series on Touch and Haptic Systems

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This chapter provides an overview of the human somatosensory system. It is the system that subserves our sense of touch, which is so essential to our awareness of the world and of our own bodies. Without it, we could not hold and manipulate objects dextrously and securely, let alone musical instruments, and we would not have a body that belongs to us. Tactile sensations, conscious or unconscious, arise from the contact of our skin with objects. It follows that the mechanics of the skin and of the hand its interaction with objects is the source of information that our brain uses to dextrously manipulate objects, as in music playing. This information is collected by vast array of mechanoreceptors that are sensitive to the effects of contacting objects, often with the fingers, even far away for the region of contact. This information is processed by neural circuits in numerous regions of the brain to provide us with extraordinary cognitive and manipulative functions that depend so fundamentally on somatosensation. IntroductionThe overarching purpose of the somatosensory system is to inform the brain of the mechanical state of the body that it inhabits. It shares this function with the vestibular system. But whereas the vestibular system operates in the low-dimensional space of head translations and rotations, the somatosensory system takes its input from almost the entire body. The main sources of information arise in part from the load-bearing structures represented by connective tissues such as tendons and ligaments, in part from the motion-producing tissues, the muscles, and in part from the outer layers of body, that is the skin. As a result, unlike the vestibular system, which is sensitive to the movements of a rigid body-the cranium-the somatosensory system relates to

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On the 1/f noise and non-integer harmonic decay of the interaction of a finger sliding on flat and sinusoidal surfaces

Cited by 56 publications

References 26 publications

The Spatial Spectrum of Tangential Skin Displacement Can Encode Tactual Texture

The Spatial Spectrum of Tangential Skin Displacement Can Encode Tactual Texture

Vibrotactile inputs to the feet can modulate vection

A Brief Overview of the Human Somatosensory System

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