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  • 1
    Online Resource
    Online Resource
    Key considerations in designing a somatosensory neuroprosthesis
    Elsevier BV ; 2016
    In:  Journal of Physiology-Paris Vol. 110, No. 4 ( 2016-11), p. 402-408
    Details
    In: Journal of Physiology-Paris, Elsevier BV, Vol. 110, No. 4 ( 2016-11), p. 402-408
    Type of Medium: Online Resource
    ISSN: 0928-4257
    URL: Article
    DOI: 10.1016/j.jphysparis.2016.11.001
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2016
    detail.hit.zdb_id: 2019365-8
    SSG: 12
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  • 2
    Online Resource
    Online Resource
    Simulating tactile signals from the whole hand with millisecond precision
    Proceedings of the National Academy of Sciences ; 2017
    In:  Proceedings of the National Academy of Sciences Vol. 114, No. 28 ( 2017-07-11)
    Details
    In: Proceedings of the National Academy of Sciences, Proceedings of the National Academy of Sciences, Vol. 114, No. 28 ( 2017-07-11)
    Abstract: When we grasp and manipulate an object, populations of tactile nerve fibers become activated and convey information about the shape, size, and texture of the object and its motion across the skin. The response properties of tactile fibers have been extensively characterized in single-unit recordings, yielding important insights into how individual fibers encode tactile information. A recurring finding in this extensive body of work is that stimulus information is distributed over many fibers. However, our understanding of population-level representations remains primitive. To fill this gap, we have developed a model to simulate the responses of all tactile fibers innervating the glabrous skin of the hand to any spatiotemporal stimulus applied to the skin. The model first reconstructs the stresses experienced by mechanoreceptors when the skin is deformed and then simulates the spiking response that would be produced in the nerve fiber innervating that receptor. By simulating skin deformations across the palmar surface of the hand and tiling it with receptors at their known densities, we reconstruct the responses of entire populations of nerve fibers. We show that the simulated responses closely match their measured counterparts, down to the precise timing of the evoked spikes, across a wide variety of experimental conditions sampled from the literature. We then conduct three virtual experiments to illustrate how the simulation can provide powerful insights into population coding in touch. Finally, we discuss how the model provides a means to establish naturalistic artificial touch in bionic hands.
    Type of Medium: Online Resource
    ISSN: 0027-8424 , 1091-6490
    URL: Article
    DOI: 10.1073/pnas.1704856114
    RVK:
    TA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: Proceedings of the National Academy of Sciences
    Publication Date: 2017
    detail.hit.zdb_id: 209104-5
    detail.hit.zdb_id: 1461794-8
    SSG: 11
    SSG: 12
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  • 3
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    Online Resource
    The neural basis of perceived intensity in natural and artificial touch
    American Association for the Advancement of Science (AAAS) ; 2016
    In:  Science Translational Medicine Vol. 8, No. 362 ( 2016-10-26)
    Details
    In: Science Translational Medicine, American Association for the Advancement of Science (AAAS), Vol. 8, No. 362 ( 2016-10-26)
    Abstract: Electrical stimulation of sensory nerves is a powerful tool for studying neural coding because it can activate neural populations in ways that natural stimulation cannot. Electrical stimulation of the nerve has also been used to restore sensation to patients who have suffered the loss of a limb. We have used long-term implanted electrical interfaces to elucidate the neural basis of perceived intensity in the sense of touch. To this end, we assessed the sensory correlates of neural firing rate and neuronal population recruitment independently by varying two parameters of nerve stimulation: pulse frequency and pulse width. Specifically, two amputees, chronically implanted with peripheral nerve electrodes, performed each of three psychophysical tasks—intensity discrimination, magnitude scaling, and intensity matching—in response to electrical stimulation of their somatosensory nerves. We found that stimulation pulse width and pulse frequency had systematic, cooperative effects on perceived tactile intensity and that the artificial tactile sensations could be reliably matched to skin indentations on the intact limb. We identified a quantity we termed the activation charge rate (ACR), derived from stimulation parameters, that predicted the magnitude of artificial tactile percepts across all testing conditions. On the basis of principles of nerve fiber recruitment, the ACR represents the total population spike count in the activated neural population. Our findings support the hypothesis that population spike count drives the magnitude of tactile percepts and indicate that sensory magnitude can be manipulated systematically by varying a single stimulation quantity.
    Type of Medium: Online Resource
    ISSN: 1946-6234 , 1946-6242
    URL: Article
    DOI: 10.1126/scitranslmed.aaf5187
    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 2016
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  • 4
    Online Resource
    Online Resource
    Feeling fooled: Texture contaminates the neural code for tactile speed
    Public Library of Science (PLoS) ; 2019
    In:  PLOS Biology Vol. 17, No. 8 ( 2019-8-27), p. e3000431-
    Details
    In: PLOS Biology, Public Library of Science (PLoS), Vol. 17, No. 8 ( 2019-8-27), p. e3000431-
    Type of Medium: Online Resource
    ISSN: 1545-7885
    URL: Article
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    DOI: 10.1371/journal.pbio.3000431
    DOI: 10.1371/journal.pbio.3000431.g001
    DOI: 10.1371/journal.pbio.3000431.g002
    DOI: 10.1371/journal.pbio.3000431.g003
    DOI: 10.1371/journal.pbio.3000431.g004
    DOI: 10.1371/journal.pbio.3000431.g005
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    DOI: 10.1371/journal.pbio.3000431.g007
    DOI: 10.1371/journal.pbio.3000431.g008
    DOI: 10.1371/journal.pbio.3000431.s001
    DOI: 10.1371/journal.pbio.3000431.s002
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    DOI: 10.1371/journal.pbio.3000431.s005
    DOI: 10.1371/journal.pbio.3000431.s006
    DOI: 10.1371/journal.pbio.3000431.s007
    DOI: 10.1371/journal.pbio.3000431.s008
    Language: English
    Publisher: Public Library of Science (PLoS)
    Publication Date: 2019
    detail.hit.zdb_id: 2126773-X
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  • 5
    Online Resource
    Online Resource
    Perception of partial slips under tangential loading of the fingertip
    Springer Science and Business Media LLC ; 2018
    In:  Scientific Reports Vol. 8, No. 1 ( 2018-05-04)
    Details
    In: Scientific Reports, Springer Science and Business Media LLC, Vol. 8, No. 1 ( 2018-05-04)
    Abstract: During tactile exploration, partial slips occur systematically at the periphery of fingertip-object contact prior to full slip. Although the mechanics of partial slips are well characterized, the perception of such events is unclear. Here, we performed psychophysical experiments to assess partial slip detection ability on smooth transparent surfaces. In these experiments, the index fingertip of human subjects was stroked passively by a smooth, transparent glass plate while we imaged the contact slipping against the glass. We found that subjects were able to detect fingertip slip before full slip occurred when, on average, only 48% of the contact area was slipping. Additionally, we showed that partial slips and plate displacement permitted slip detection, but that the subjects could not rely on tangential force to detect slipping of the plate. Finally, we observed that, keeping the normal contact force constant, slip detection was impeded when the plate was covered with a hydrophobic coating dramatically lowering the contact friction and therefore the amount of fingertip deformation. Together, these results demonstrate that partial slips play an important role in fingertip slip detection and support the hypothesis that the central nervous system relies on them to adjust grip force during object manipulation.
    Type of Medium: Online Resource
    ISSN: 2045-2322
    URL: Article
    DOI: 10.1038/s41598-018-25226-w
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2018
    detail.hit.zdb_id: 2615211-3
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  • 6
    Online Resource
    Online Resource
    Measuring fingerpad deformation during active object manipulation
    American Physiological Society ; 2021
    In:  Journal of Neurophysiology Vol. 126, No. 4 ( 2021-10-01), p. 1455-1464
    Details
    In: Journal of Neurophysiology, American Physiological Society, Vol. 126, No. 4 ( 2021-10-01), p. 1455-1464
    Abstract: During active object manipulation, the finger-object interactions give rise to complex fingertip skin deformations. These deformations are in turn encoded by the local tactile afferents and provide rich and behaviorally relevant information to the central nervous system. Most of the work studying the mechanical response of the finger to dynamic loading has been performed under a passive setup, thereby precisely controlling the kinematics or the dynamics of the loading. However, to identify aspects of the deformations that are relevant to online control during object manipulation, it is desirable to measure the skin response in an active setup. To that end, we developed a device that allows us to monitor finger forces, skin deformations, and kinematics during fine manipulation. We describe the device in detail and test it to precisely describe how the fingertip skin in contact with the object deforms during a simple vertical oscillation task. We show that the level of grip force directly influences the fingerpad skin strains and that the strain rates are substantial during active manipulation (norm up to 100%/s). The developed setup will enable us to causally relate sensory information, i.e. skin deformation, to online control, i.e. grip force adjustment, in future studies. NEW & NOTEWORTHY We present a novel device, a manipulandum, that enables to image the contact between the finger and the contact surface during active manipulation of the device. The device is tested in a simple vertical oscillation task involving 18 participants. We demonstrate that substantial surface skin strains take place at the finger-object interface and argue that those deformations provide essential information for grasp stability during object manipulation.
    Type of Medium: Online Resource
    ISSN: 0022-3077 , 1522-1598
    URL: Article
    DOI: 10.1152/jn.00358.2021
    RVK:
    XA 10000 ; XA 552555
    Language: English
    Publisher: American Physiological Society
    Publication Date: 2021
    detail.hit.zdb_id: 80161-6
    detail.hit.zdb_id: 1467889-5
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  • 7
    Online Resource
    Online Resource
    Biomechanics of the finger pad in response to torsion
    The Royal Society ; 2023
    In:  Journal of The Royal Society Interface Vol. 20, No. 201 ( 2023-04)
    Details
    In: Journal of The Royal Society Interface, The Royal Society, Vol. 20, No. 201 ( 2023-04)
    Abstract: Surface skin deformation of the finger pad during partial slippage at finger–object interfaces elicits firing of the tactile sensory afferents. A torque around the contact normal is often present during object manipulation, which can cause partial rotational slippage. Until now, studies of surface skin deformation have used stimuli sliding rectilinearly and tangentially to the skin. Here, we study surface skin dynamics under pure torsion of the right index finger of seven adult participants (four males). A custom robotic platform stimulated the finger pad with a flat clean glass surface, controlling the normal forces and rotation speeds applied while monitoring the contact interface using optical imaging. We tested normal forces between 0.5 N and 10 N at a fixed angular velocity of 20° s −1 and angular velocities between 5° s −1 and 100° s −1 at a fixed normal force of 2 N. We observe the characteristic pattern by which partial slips develop, starting at the periphery of the contact and propagating towards its centre, and the resulting surface strains. The 20-fold range of normal forces and angular velocities used highlights the effect of those parameters on the resulting torque and skin strains. Increasing normal force increases the contact area, the generated torque, strains and the twist angle required to reach full slip. On the other hand, increasing angular velocity causes more loss of contact at the periphery and higher strain rates (although it has no impact on resulting strains after the full rotation). We also discuss the surprisingly large inter-individual variability in skin biomechanics, notably observed in the twist angle the stimulus needs to rotate before reaching full slip.
    Type of Medium: Online Resource
    ISSN: 1742-5662
    URL: Article
    DOI: 10.1098/rsif.2022.0809
    Language: English
    Publisher: The Royal Society
    Publication Date: 2023
    detail.hit.zdb_id: 2156283-0
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  • 8
    Online Resource
    Online Resource
    A haptic illusion created by gravity
    Elsevier BV ; 2023
    In:  iScience Vol. 26, No. 7 ( 2023-07), p. 107246-
    Details
    In: iScience, Elsevier BV, Vol. 26, No. 7 ( 2023-07), p. 107246-
    Type of Medium: Online Resource
    ISSN: 2589-0042
    URL: Article
    DOI: 10.1016/j.isci.2023.107246
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2023
    detail.hit.zdb_id: 2927064-9
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  • 9
    Online Resource
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    Sensory adaptation to electrical stimulation of the somatosensory nerves
    IOP Publishing ; 2018
    In:  Journal of Neural Engineering Vol. 15, No. 4 ( 2018-08-01), p. 046002-
    Details
    In: Journal of Neural Engineering, IOP Publishing, Vol. 15, No. 4 ( 2018-08-01), p. 046002-
    Type of Medium: Online Resource
    ISSN: 1741-2560 , 1741-2552
    URL: Article
    DOI: 10.1088/1741-2552/aab790
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 2135187-9
    SSG: 12
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  • 10
    Online Resource
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    High-resolution imaging of skin deformation shows that afferents from human fingertips signal slip onset
    eLife Sciences Publications, Ltd ; 2021
    In:  eLife Vol. 10 ( 2021-04-22)
    Details
    In: eLife, eLife Sciences Publications, Ltd, Vol. 10 ( 2021-04-22)
    Abstract: Each fingertip hosts thousands of nerve fibers that allow us to handle objects with great dexterity. These fibers relay the amount of friction between the skin and the item, and the brain uses this sensory feedback to adjust the grip as necessary. Yet, exactly how tactile nerve fibers encode information about friction remains largely unknown. Previous research has suggested that friction might not be recorded per se in nerve signals to the brain. Instead, fibers in the finger pad might be responding to localized ‘partial slips’ that indicate an impending loss of grip. Indeed, when lifting an object, fingertips are loaded with a tangential force that puts strain on the skin, resulting in subtle local deformations. Nerve fibers might be able to detect these skin changes, prompting the brain to adjust an insecure grip before entirely losing grasp of an object. However, technical challenges have made studying the way tactile nerve fibers respond to slippage and skin strain difficult. For the first time, Delhaye et al. have now investigated how these fibers respond to and encode information about the strain placed on fingertips as they are loaded tangentially. A custom-made imaging apparatus was paired with standard electrodes to record the activity of four different kinds of tactile nerve fibers in participants who had a fingertip placed against a plate of glass. The imaging focused on revealing changes in skin surface as tangential force was applied; the electrodes measured impulses from individual nerve fibers from the fingertip. While all the fibers responded during partial slips, fast-adapting type 1 nerves generated strong responses that signal a local loss of grip. Recordings showed that these fibers consistently encoded changes in the skin strain patterns, and were more sensitive to skin compressions related to slippage than to stretch. These results show how tactile nerve fibers encode the subtle skin compressions created when fingers handle objects. The methods developed by Delhaye et al. could further be used to explore the response properties of tactile nerve fibers, sensory feedback and grip.
    Type of Medium: Online Resource
    ISSN: 2050-084X
    URL: Article
    DOI: 10.7554/eLife.64679
    Language: English
    Publisher: eLife Sciences Publications, Ltd
    Publication Date: 2021
    detail.hit.zdb_id: 2687154-3
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