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Artikel ; Online: When mechanical engineering inspired from physiology improves postural-related somatosensory processes.

Sutter, Chloé / Fabre, Marie / Massi, Francesco / Blouin, Jean / Mouchnino, Laurence

2023 Band 13, Heft 1, Seite(n) 19495

Abstract: Despite numerous studies uncovering the neural signature of tactile processing, tactile afferent inputs relating to the contact surface has not been studied so far. Foot tactile receptors being the first stimulated by the relative movement of the foot ... ...

Abstract	Despite numerous studies uncovering the neural signature of tactile processing, tactile afferent inputs relating to the contact surface has not been studied so far. Foot tactile receptors being the first stimulated by the relative movement of the foot skin and the underneath moving support play an important role in the sensorimotor transformation giving rise to a postural reaction. A biomimetic surface, i.e., complying with the skin dermatoglyphs and tactile receptors characteristics should facilitate the cortical processes. Participants (n = 15) stood either on a biomimetic surface or on two control surfaces, when a sudden acceleration of the supporting surface was triggered (experiment 1). A larger intensity and shorter somatosensory response (i.e., SEP) was evoked by the biomimetic surface motion. This result and the associated decrease of theta activity (5-7 Hz) over the posterior parietal cortex suggest that increasing the amount of sensory input processing could make the balance task less challenging when standing on a biomimetic surface. This key point was confirmed by a second experiment (n = 21) where a cognitive task was added, hence decreasing the attentional resources devoted to the balance motor task. Greater efficiency of the postural reaction was observed while standing on the biomimetic than on the control surfaces.
Mesh-Begriff(e)	Humans ; Touch/physiology ; Movement/physiology ; Attention ; Postural Balance/physiology ; Somatosensory Cortex/physiology
Sprache	Englisch
Erscheinungsdatum	2023-11-09
Erscheinungsland	England
Dokumenttyp	Journal Article
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-023-45381-z
Datenquelle	MEDical Literature Analysis and Retrieval System OnLINE

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Artikel: On the Dynamics of Spatial Updating.

Blouin, Jean / Pialasse, Jean-Philippe / Mouchnino, Laurence / Simoneau, Martin

Frontiers in neuroscience

2022 Band 16, Seite(n) 780027

Abstract: Most of our knowledge on the human neural bases of spatial updating comes from functional magnetic resonance imaging (fMRI) studies in which recumbent participants moved in virtual environments. As a result, little is known about the dynamic of spatial ... ...

Abstract	Most of our knowledge on the human neural bases of spatial updating comes from functional magnetic resonance imaging (fMRI) studies in which recumbent participants moved in virtual environments. As a result, little is known about the dynamic of spatial updating during real body motion. Here, we exploited the high temporal resolution of electroencephalography (EEG) to investigate the dynamics of cortical activation in a spatial updating task where participants had to remember their initial orientation while they were passively rotated about their vertical axis in the dark. After the rotations, the participants pointed toward their initial orientation. We contrasted the EEG signals with those recorded in a control condition in which participants had no cognitive task to perform during body rotations. We found that the amplitude of the P
Sprache	Englisch
Erscheinungsdatum	2022-02-17
Erscheinungsland	Switzerland
Dokumenttyp	Journal Article
ZDB-ID	2411902-7
ISSN	1662-453X ; 1662-4548
ISSN (online)	1662-453X
ISSN	1662-4548
DOI	10.3389/fnins.2022.780027
Datenquelle	MEDical Literature Analysis and Retrieval System OnLINE

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Artikel: Partial Unweighting in Obese Persons Enhances Tactile Transmission From the Periphery to Cortical Areas: Impact on Postural Adjustments.

Fabre, Marie / Sainton, Patrick / Sutter, Chloé / Mouchnino, Laurence / Chavet, Pascale

Frontiers in human neuroscience

2022 Band 16, Seite(n) 782028

Abstract: Tactile plantar information is known to play an important role in balance maintenance and to contribute to the setting of anticipatory postural adjustments (APAs) prior to stepping. Previous studies have suggested that somatosensory processes do not ... ...

Abstract	Tactile plantar information is known to play an important role in balance maintenance and to contribute to the setting of anticipatory postural adjustments (APAs) prior to stepping. Previous studies have suggested that somatosensory processes do not function optimally for obese individuals due to the increased pressure of the plantar sole resulting in balance issues. Here, we investigated whether decreasing the compression of the mechanoreceptors by unweighting the plantar sole would enhance tactile sensory processes leading to an increased stability and an accurate setting of the APAs in obese individuals. More specifically, we tested the hypothesis that the somatosensory cortex response to electric stimulation (SEP) of the plantar sole in standing obese persons will be greater with reduced body weight than with their effective weight. The level of unweighting was calculated for each participant to correspond to a healthy body mass index. We showed an increase SEP amplitude in the unweighted condition compared to the effective body weight for all participants. This increase can be explained by the reduction of weight itself but also by the modified distribution of the pressure exerted onto the foot sole. Indeed, in the unweighted condition, the vertical ground reaction forces are evenly distributed over the surface of the foot. This suggests that decreasing and equalizing the pressure applied on the plantar mechanoreceptors results in an increase in somatosensory transmission and sensory processes for obese persons when unweighted. These sensory processes are crucial prior to step initiation and for setting the anticipatory postural adjustments (i.e., thrust). These cortical changes could have contributed to the observed changes in the spatiotemporal characteristics of the thrust prior to step initiation.
Sprache	Englisch
Erscheinungsdatum	2022-06-14
Erscheinungsland	Switzerland
Dokumenttyp	Journal Article
ZDB-ID	2425477-0
ISSN	1662-5161
ISSN	1662-5161
DOI	10.3389/fnhum.2022.782028
Datenquelle	MEDical Literature Analysis and Retrieval System OnLINE

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Artikel ; Online: Keeping in touch with our hidden side.

Mathieu, Benjamin / Abillama, Antonin / Martinez, Malvina / Mouchnino, Laurence / Blouin, Jean

Neuroscience letters

2022 Band 782, Seite(n) 136693

Abstract: Previous studies have shown that the sensory modality used to identify regions of the body hidden from sight, but frequently viewed, influences the type of the body representation employed for reaching them with the finger. The question then arises as to ...

Abstract	Previous studies have shown that the sensory modality used to identify regions of the body hidden from sight, but frequently viewed, influences the type of the body representation employed for reaching them with the finger. The question then arises as to whether this observation also applies to body regions which are rarely, if ever, viewed. We used an established technique for pinpointing the type of body representation used for the spatial encoding of targets which consisted of assessing the effect of peripheral gaze fixation on the pointing accuracy. More precisely, an exteroceptive, visually dependent, body representation is thought to be used if gaze deviation induces a deviation of the pointing movement. Three light-emitting diodes (LEDs) were positioned at the participants' eye level at -25 deg, 0 deg and +25 deg. Without moving the head, the participant fixated the lit LED before the experimenter indicated one of the three target head positions: topmost point of the head (vertex) and two other points located at the front and back of the head. These targets were either verbal-cued or tactile-cued and the participants had to reach them with their index finger. We analysed the accuracy of the movements directed to the topmost point of the head, which is a well-defined, yet out of view anatomical point. Based on the possibility of the brain to create visual representations of the body areas that remain out of view, we hypothesized that the position of the vertex is encoded using an exteroceptive body representation, both when verbally or tactile-cued. Results revealed that the pointing errors were biased in the opposite direction of gaze fixation for both verbal-cued and tactile-cued targets, suggesting the use of a vision-dependent exteroceptive body representation. The enhancement of the visual body representations by sensorimotor processes was suggested by the greater pointing accuracy when the vertex was identified by tactile stimulation compared to verbal instruction. Moreover, a control condition showed that participants were more accurate in indicating the position of their own vertex than the vertex of other people. Together, our results suggest that the position of rarely viewed body parts are spatially encoded by an exteroceptive body representation and that non-visual sensorimotor processes are involved in the constructing of this representation.
Mesh-Begriff(e)	Cues ; Fingers/physiology ; Fixation, Ocular ; Humans ; Movement/physiology ; Psychomotor Performance/physiology ; Touch Perception
Sprache	Englisch
Erscheinungsdatum	2022-05-20
Erscheinungsland	Ireland
Dokumenttyp	Journal Article
ZDB-ID	194929-9
ISSN	1872-7972 ; 0304-3940
ISSN (online)	1872-7972
ISSN	0304-3940
DOI	10.1016/j.neulet.2022.136693
Datenquelle	MEDical Literature Analysis and Retrieval System OnLINE

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Artikel: Cortical facilitation of tactile afferents during the preparation of a body weight transfer when standing on a biomimetic surface.

Sutter, Chloé / Moinon, Alix / Felicetti, Livia / Massi, Francesco / Blouin, Jean / Mouchnino, Laurence

Frontiers in neurology

2023 Band 14, Seite(n) 1175667

Abstract: Self-generated movement shapes tactile perception, but few studies have investigated the brain mechanisms involved in the processing of the mechanical signals related to the static and transient skin deformations generated by forces and pressures exerted ...

Abstract	Self-generated movement shapes tactile perception, but few studies have investigated the brain mechanisms involved in the processing of the mechanical signals related to the static and transient skin deformations generated by forces and pressures exerted between the foot skin and the standing surface. We recently found that standing on a biomimetic surface (i.e., inspired by the characteristics of mechanoreceptors and skin dermatoglyphics), that magnified skin-surface interaction, increased the sensory flow to the somatosensory cortex and improved balance control compared to standing on control (e.g., smooth) surfaces. In this study, we tested whether the well-known sensory suppression that occurs during movements is alleviated when the tactile afferent signal becomes relevant with the use of a biomimetic surface. Eyes-closed participants
Sprache	Englisch
Erscheinungsdatum	2023-06-19
Erscheinungsland	Switzerland
Dokumenttyp	Journal Article
ZDB-ID	2564214-5
ISSN	1664-2295
ISSN	1664-2295
DOI	10.3389/fneur.2023.1175667
Datenquelle	MEDical Literature Analysis and Retrieval System OnLINE

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Artikel ; Online: Overpressure on fingertips prevents state estimation of the pen grip force and movement accuracy.

Danna, Jérémy / Nordlund, Mathilde / Louber, Didier / Moré, Simon / Mouchnino, Laurence

Experimental brain research

2021 Band 240, Heft 1, Seite(n) 189–198

Abstract: We tested the hypothesis that the inability to move a pen accurately in a graphic task is partly due to a decrease of afferent somatosensory information resulting from overpressure on the tactile receptors of the fingers holding the pen. To disentangle ... ...

Abstract	We tested the hypothesis that the inability to move a pen accurately in a graphic task is partly due to a decrease of afferent somatosensory information resulting from overpressure on the tactile receptors of the fingers holding the pen. To disentangle the depressed somatosensory origin from an altered motor command, we compared a condition in which the participant actively produces pressure on the pen (active grip) with a condition in which pressure is passively applied (passive grip, no grip-related motor command). We expected that the response of the somatosensory cortex to electric stimulation of the wrist's tactile nerve (i.e., SEP) would be greater in the natural pen grip (baseline condition) than in the two overpressure conditions (actively or passively induced). Fifteen adults were required to trace a geometrical shape in the three grip conditions. The SEP amplitude was not significantly different between the baseline and both overpressure conditions. However, behavioral results showed that drawing accuracy is impaired when the pressure on the pen is increased (passively or actively). Cortical source analyses revealed that the activity of the superior parietal areas (SPL) increased in both overpressure conditions. Our findings suggest that the SPL is critical for sensorimotor integration, by maintaining an internal representation of pen holding. These cortical changes might witness the impaired updating of the finger-pen interaction force for such drawing actions under visual guidance.
Mesh-Begriff(e)	Adult ; Fingers ; Hand Strength ; Humans ; Movement ; Somatosensory Cortex ; Touch
Sprache	Englisch
Erscheinungsdatum	2021-10-23
Erscheinungsland	Germany
Dokumenttyp	Journal Article
ZDB-ID	1201-4
ISSN	1432-1106 ; 0014-4819
ISSN (online)	1432-1106
ISSN	0014-4819
DOI	10.1007/s00221-021-06246-x
Datenquelle	MEDical Literature Analysis and Retrieval System OnLINE

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Artikel: Behavioral and Electrocortical Response to a Sensorimotor Conflict in Individuals with Fibromyalgia.

Augière, Tania / Simoneau, Martin / Brun, Clémentine / Pinard, Anne Marie / Blouin, Jean / Mouchnino, Laurence / Mercier, Catherine

Brain sciences

2023 Band 13, Heft 6

Abstract: People with fibromyalgia have been shown to experience more somatosensory disturbances than pain-free controls during sensorimotor conflicts (i.e., incongruence between visual and somatosensory feedback). Sensorimotor conflicts are known to disturb the ... ...

Abstract	People with fibromyalgia have been shown to experience more somatosensory disturbances than pain-free controls during sensorimotor conflicts (i.e., incongruence between visual and somatosensory feedback). Sensorimotor conflicts are known to disturb the integration of sensory information. This study aimed to assess the cerebral response and motor performance during a sensorimotor conflict in people with fibromyalgia. Twenty participants with fibromyalgia and twenty-three pain-free controls performed a drawing task including visual feedback that was either congruent with actual movement (and thus with somatosensory information) or incongruent with actual movement (i.e., conflict). Motor performance was measured according to tracing error, and electrocortical activity was recorded using electroencephalography. Motor performance was degraded during conflict for all participants but did not differ between groups. Time-frequency analysis showed that the conflict was associated with an increase in theta power (4-8 Hz) at conflict onset over the left posterior parietal cortex in participants with fibromyalgia but not in controls. This increase in theta suggests a stronger detection of conflict in participants with fibromyalgia, which was not accompanied by differences in motor performance in comparison to controls. This points to dissociation in individuals with fibromyalgia between an altered perception of action and a seemingly unaltered control of action.
Sprache	Englisch
Erscheinungsdatum	2023-06-08
Erscheinungsland	Switzerland
Dokumenttyp	Journal Article
ZDB-ID	2651993-8
ISSN	2076-3425
ISSN	2076-3425
DOI	10.3390/brainsci13060931
Datenquelle	MEDical Literature Analysis and Retrieval System OnLINE

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Artikel ; Online: Cortical facilitation of somatosensory inputs using gravity-related tactile information in humans with vestibular hypofunction.

Fabre, Marie / Beullier, Laura / Sutter, Chloé / Kebritchi, Amirreza / Chavet, Pascale / Simoneau, Martin / Toupet, Michel / Blouin, Jean / Mouchnino, Laurence

Journal of neurophysiology

2023 Band 130, Heft 1, Seite(n) 155–167

Abstract: A few years after their bilateral vestibular loss, patients usually show a motor repertoire that is almost back to normal. This recovery is thought to involve an upregulation of the visual and proprioceptive information that compensates for the lack of ... ...

Abstract	A few years after their bilateral vestibular loss, patients usually show a motor repertoire that is almost back to normal. This recovery is thought to involve an upregulation of the visual and proprioceptive information that compensates for the lack of vestibular information. Here, we investigated whether plantar tactile inputs, which provide body information relative to the ground and to the Earth vertical, contribute to this compensation. More specifically, we tested the hypothesis that somatosensory cortex response to electric stimulation of the plantar sole in standing adults will be greater in humans (
Mesh-Begriff(e)	Adult ; Humans ; Proprioception/physiology ; Postural Balance/physiology ; Foot ; Vestibule, Labyrinth/physiology ; Electric Stimulation
Sprache	Englisch
Erscheinungsdatum	2023-06-14
Erscheinungsland	United States
Dokumenttyp	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	80161-6
ISSN	1522-1598 ; 0022-3077
ISSN (online)	1522-1598
ISSN	0022-3077
DOI	10.1152/jn.00406.2022
Datenquelle	MEDical Literature Analysis and Retrieval System OnLINE

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Artikel ; Online: Seeing our hand or a tool during visually-guided actions: Different effects on the somatosensory and visual cortices.

Mathieu, Benjamin / Abillama, Antonin / Moré, Simon / Mercier, Catherine / Simoneau, Martin / Danna, Jérémy / Mouchnino, Laurence / Blouin, Jean

Neuropsychologia

2023 Band 185, Seite(n) 108582

Abstract: The processing of proprioceptive information in the context of a conflict between visual and somatosensory feedbacks deteriorates motor performance. Previous studies have shown that seeing one's hand increases the weighting assigned to arm somatosensory ... ...

Abstract	The processing of proprioceptive information in the context of a conflict between visual and somatosensory feedbacks deteriorates motor performance. Previous studies have shown that seeing one's hand increases the weighting assigned to arm somatosensory inputs. In this light, we hypothesized that the sensory conflict, when tracing the contour of a shape with mirror-reversed vision, will be greater for participants who trace with a stylus seen in their hand (Hand group, n = 17) than for participants who trace with the tip of rod without seen their hand (Tool group, n = 15). Based on this hypothesis, we predicted that the tracing performance with mirror vision will be more deteriorated for the Hand group than for the Tool group, and we predicted a greater gating of somatosensory information for the Hand group to reduce the sensory conflict. The participants of both groups followed the outline of a shape in two visual conditions. Direct vision: the participants saw the hand or portion of a light 40 cm rod directly. Mirror Vision: the hand or the rod was seen through a mirror. We measured tracing performance using a digitizing tablet and the cortical activity with electroencephalography. Behavioral analyses revealed that the tracing performance of both groups was similarly impaired by mirror vision. However, contrasting the spectral content of the cortical oscillatory activity between the Mirror and Direct conditions, we observed that tracing with mirror vision resulted in significantly larger alpha (8-12 Hz) and beta (15-25 Hz) powers in the somatosensory cortex for participants of the Hand group. The somatosensory alpha and beta powers did not significantly differ between Mirror and Direct vision conditions for the Tool group. For both groups, tracing with mirror vision altered the activity of the visual cortex: decreased alpha power for the Hand group, decreased alpha and beta power for the Tool group. Overall, these results suggest that seeing the hand enhanced the sensory conflict when tracing with mirror vision and that the increase of alpha and beta powers in the somatosensory cortex served to reduce the weight assigned to somatosensory information. The increased activity of the visual cortex observed for both groups in the mirror vision condition suggests greater visual processing with increased task difficulty. Finally, the fact that the participants of the Tool group did not show better tracing performance than those of the Hand group suggests that tracing deterioration resulted from a sensorimotor conflict (as opposed to a visuo-proprioceptive conflict).
Mesh-Begriff(e)	Humans ; Psychomotor Performance ; Visual Perception ; Hand ; Proprioception ; Visual Cortex ; Vision Disorders
Sprache	Englisch
Erscheinungsdatum	2023-04-28
Erscheinungsland	England
Dokumenttyp	Journal Article
ZDB-ID	207151-4
ISSN	1873-3514 ; 0028-3932
ISSN (online)	1873-3514
ISSN	0028-3932
DOI	10.1016/j.neuropsychologia.2023.108582
Datenquelle	MEDical Literature Analysis and Retrieval System OnLINE

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Artikel: Supplementary Motor Area and Superior Parietal Lobule Restore Sensory Facilitation Prior to Stepping When a Decrease of Afferent Inputs Occurs.

Lhomond, Olivia / Teasdale, Normand / Simoneau, Martin / Mouchnino, Laurence

Frontiers in neurology

2019 Band 9, Seite(n) 1132

Abstract: The weighting of the sensory inputs is not uniform during movement preparation and execution. For instance, a transient increase in the transmission to the cortical level of cutaneous input ~700 ms was observed before participants initiated a step ... ...

Abstract	The weighting of the sensory inputs is not uniform during movement preparation and execution. For instance, a transient increase in the transmission to the cortical level of cutaneous input ~700 ms was observed before participants initiated a step forward. The sensory facilitation occurred at a time when feet cutaneous information is critical for setting the forces to be exerted onto the ground to shift the center of mass toward the supporting side prior to foot-off. Despite clear evidence of task-dependent modulation of the early somatosensory signal transmission, the neural mechanisms are mainly unknown. One hypothesis suggests that during movement preparation the premotor cortex and specifically the supplementary motor area (SMA) can be the source of an efferent signal that facilitates the somatosensory processes irrespectively of the amount of sensory inputs arriving at the somatosensory areas. Here, we depressed mechanically the plantar sole cutaneous transmission by increasing pressure under the feet by adding an extra body weight to test whether the task-dependent modulation is present during step preparation. Results showed upregulation of the neural response to tactile stimulation in the extra-weight condition during the stepping preparation whereas depressed neural response was still observed in standing condition. Source localization indicated the SMA and to a lesser extent the superior parietal lobule (SPL) areas as the likely origin of the response modulation. Upregulating cutaneous inputs (when mechanically depressed) at an early stage by efferent signals from the motor system could be an attempt to restore the level of sensory afferents to make it suitable for setting the anticipatory adjustments prior to step initiation.
Sprache	Englisch
Erscheinungsdatum	2019-01-04
Erscheinungsland	Switzerland
Dokumenttyp	Journal Article
ZDB-ID	2564214-5
ISSN	1664-2295
ISSN	1664-2295
DOI	10.3389/fneur.2018.01132
Datenquelle	MEDical Literature Analysis and Retrieval System OnLINE

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