Effect of gravity-like torque on goal-directed arm movements in microgravity

Bringoux, Lionel; Blouin, Jean; Coyle, Thelma; Ruget, H.; Mouchnino, Laurence

doi:10.1152/jn.00364.2011

Cited by 45 publications

(66 citation statements)

References 48 publications

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“…In line with this claim, several studies support the idea of a prior integration of predicted gravitational effects on arm motor command [19]–[21], [35], [36], [47]–[49]. Here we also found that arm movement control was modified at an early stage since body tilt, whatever the scene orientation, induced an early modification of movement pattern with a lower PA compared to when the body was not tilted.…”

Section: Discussionsupporting

confidence: 91%

“…This allowed us to compute the angular pointing position in the sagittal plane relative to the eye elevation (i.e., HREL) for the entire movement, which took into account instantaneous chair orientation. Arm movement onset and offset were defined when angular velocity in the sagittal plane respectively reached above and dropped below 5% of peak velocity [10], [19], [21], [27], [35], [36]. Final position (i.e., movement endpoint) was calculated from the angle between the index and HREL (i.e., target location).…”

Section: Methodsmentioning

confidence: 99%

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Combined Influence of Visual Scene and Body Tilt on Arm Pointing Movements: Gravity Matters!

et al. 2014

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Performing accurate actions such as goal-directed arm movements requires taking into account visual and body orientation cues to localize the target in space and produce appropriate reaching motor commands. We experimentally tilted the body and/or the visual scene to investigate how visual and body orientation cues are combined for the control of unseen arm movements. Subjects were asked to point toward a visual target using an upward movement during slow body and/or visual scene tilts. When the scene was tilted, final pointing errors varied as a function of the direction of the scene tilt (forward or backward). Actual forward body tilt resulted in systematic target undershoots, suggesting that the brain may have overcompensated for the biomechanical movement facilitation arising from body tilt. Combined body and visual scene tilts also affected final pointing errors according to the orientation of the visual scene. The data were further analysed using either a body-centered or a gravity-centered reference frame to encode visual scene orientation with simple additive models (i.e., ‘combined’ tilts equal to the sum of ‘single’ tilts). We found that the body-centered model could account only for some of the data regarding kinematic parameters and final errors. In contrast, the gravity-centered modeling in which the body and visual scene orientations were referred to vertical could explain all of these data. Therefore, our findings suggest that the brain uses gravity, thanks to its invariant properties, as a reference for the combination of visual and non-visual cues.

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Section: Discussionsupporting

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Combined Influence of Visual Scene and Body Tilt on Arm Pointing Movements: Gravity Matters!

et al. 2014

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“…Stimulation of cutaneous and vestibular receptors is considered as a mean to enhance reference systems which are used in sensorimotor processes, particularly in the absence of gravity-based sensory inputs as in weightlessness [21]–[24]. Here, we tested whether establishing a reference system with similar sensory stimulation in microgravity would give rise to a facilitation of the proprioceptive input during the step planning similar to that identified in normogravity but not seen in the absence of gravity [18].…”

Section: Discussionmentioning

confidence: 99%

“…Studies have suggested that it could result from the absence of gravity-based sensory inputs [21]–[24]. For instance, Clément and Lestienne [25] observed in astronauts, a large body tilt and the impossibility of maintaining a vertical posture.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, Parker et al [26] observed again on astronauts, modifications of perceived self-motion during sinusoidal roll, which had been correctly interpreted as a pure roll in a pre-flight condition, but as a translation motion immediately post-flight (i.e., otolith tilt-translation reinterpretation hypothesis). The non-functionality of proprioceptive inputs could also be responsible for the larger errors in goal-directed movements observed in weightlessness [21],[27],[28].…”

Section: Introductionmentioning

confidence: 99%

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Do Gravity-Related Sensory Information Enable the Enhancement of Cortical Proprioceptive Inputs When Planning a Step in Microgravity?

et al. 2014

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We recently found that the cortical response to proprioceptive stimulation was greater when participants were planning a step than when they stood still, and that this sensory facilitation was suppressed in microgravity. The aim of the present study was to test whether the absence of gravity-related sensory afferents during movement planning in microgravity prevented the proprioceptive cortical processing to be enhanced. We reestablished a reference frame in microgravity by providing and translating a horizontal support on which the participants were standing and verified whether this procedure restored the proprioceptive facilitation. The slight translation of the base of support (lateral direction), which occurred prior to step initiation, stimulated at least cutaneous and vestibular receptors. The sensitivity to proprioceptive stimulation was assessed by measuring the amplitude of the cortical somatosensory-evoked potential (SEP, over the Cz electrode) following the vibration of the leg muscle. The vibration lasted 1 s and the participants were asked to either initiate a step at the vibration offset or to remain still. We found that the early SEP (90–160 ms) was smaller when the platform was translated than when it remained stationary, revealing the existence of an interference phenomenon (i.e., when proprioceptive stimulation is preceded by the stimulation of different sensory modalities evoked by the platform translation). By contrast, the late SEP (550 ms post proprioceptive stimulation onset) was greater when the translation preceded the vibration compared to a condition without pre-stimulation (i.e., no translation). This suggests that restoring a body reference system which is impaired in microgravity allowed a greater proprioceptive cortical processing. Importantly, however, the late SEP was similarly increased when participants either produced a step or remained still. We propose that the absence of step-induced facilitation of proprioceptive cortical processing results from a decreased weight of proprioception in the absence of balance constraints in microgravity.

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Exercise, fatigue and proprioception: a retrospective

Proske

2019

Exp Brain Res

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Effect of gravity-like torque on goal-directed arm movements in microgravity

Abstract: Bringoux L, Blouin J, Coyle T, Ruget H, Mouchnino L. Effect of gravity-like torque on goal-directed arm movements in microgravity.

Cited by 45 publications

References 48 publications

Combined Influence of Visual Scene and Body Tilt on Arm Pointing Movements: Gravity Matters!

Combined Influence of Visual Scene and Body Tilt on Arm Pointing Movements: Gravity Matters!

Do Gravity-Related Sensory Information Enable the Enhancement of Cortical Proprioceptive Inputs When Planning a Step in Microgravity?

Exercise, fatigue and proprioception: a retrospective

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