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Verdel D, Bastide S, Geffard F, Bruneau O, Vignais N, Berret B. Reoptimization of single-joint motor patterns to non-Earth gravity torques induced by a robotic exoskeleton. iScience 2023; 26:108350. [PMID: 38026148 PMCID: PMC10665922 DOI: 10.1016/j.isci.2023.108350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 01/29/2023] [Accepted: 10/24/2023] [Indexed: 12/01/2023] Open
Abstract
Gravity is a ubiquitous component of our environment that we have learned to optimally integrate in movement control. Yet, altered gravity conditions arise in numerous applications from space exploration to rehabilitation, thereby pressing the sensorimotor system to adapt. Here, we used a robotic exoskeleton to reproduce the elbow joint-level effects of arbitrary gravity fields ranging from 1g to -1g, passing through Mars- and Moon-like gravities, and tested whether humans can reoptimize their motor patterns accordingly. By comparing the motor patterns of actual arm movements with those predicted by an optimal control model, we show that our participants (N = 61 ) adapted optimally to each gravity-like torque. These findings suggest that the joint-level effects of a large range of gravities can be efficiently apprehended by humans, thus opening new perspectives in arm weight support training in manipulation tasks, whether it be for patients or astronauts.
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Affiliation(s)
- Dorian Verdel
- Université Paris-Saclay, CIAMS, 91405 Orsay, France
- CIAMS, Université d’Orléans, Orléans, France
| | - Simon Bastide
- Université Paris-Saclay, CIAMS, 91405 Orsay, France
- CIAMS, Université d’Orléans, Orléans, France
| | | | - Olivier Bruneau
- LURPA, Mechanical Engineering Department, ENS Paris-Saclay, Université Paris-Saclay, 91190 Gif-sur-Yvette, France
| | - Nicolas Vignais
- Université Paris-Saclay, CIAMS, 91405 Orsay, France
- CIAMS, Université d’Orléans, Orléans, France
| | - Bastien Berret
- Université Paris-Saclay, CIAMS, 91405 Orsay, France
- CIAMS, Université d’Orléans, Orléans, France
- Institut Universitaire de France, Paris, France
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Thomas E, Ali FB, Tolambiya A, Chambellant F, Gaveau J. Too much information is no information: how machine learning and feature selection could help in understanding the motor control of pointing. Front Big Data 2023; 6:921355. [PMID: 37546547 PMCID: PMC10399757 DOI: 10.3389/fdata.2023.921355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Accepted: 06/16/2023] [Indexed: 08/08/2023] Open
Abstract
The aim of this study was to develop the use of Machine Learning techniques as a means of multivariate analysis in studies of motor control. These studies generate a huge amount of data, the analysis of which continues to be largely univariate. We propose the use of machine learning classification and feature selection as a means of uncovering feature combinations that are altered between conditions. High dimensional electromyogram (EMG) vectors were generated as several arm and trunk muscles were recorded while subjects pointed at various angles above and below the gravity neutral horizontal plane. We used Linear Discriminant Analysis (LDA) to carry out binary classifications between the EMG vectors for pointing at a particular angle, vs. pointing at the gravity neutral direction. Classification success provided a composite index of muscular adjustments for various task constraints-in this case, pointing angles. In order to find the combination of features that were significantly altered between task conditions, we conducted a post classification feature selection i.e., investigated which combination of features had allowed for the classification. Feature selection was done by comparing the representations of each category created by LDA for the classification. In other words computing the difference between the representations of each class. We propose that this approach will help with comparing high dimensional EMG patterns in two ways; (i) quantifying the effects of the entire pattern rather than using single arbitrarily defined variables and (ii) identifying the parts of the patterns that convey the most information regarding the investigated effects.
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Affiliation(s)
- Elizabeth Thomas
- INSERMU1093, UFR STAPS, Université de Bourgogne Franche Comté, Dijon, France
| | - Ferid Ben Ali
- School of Engineering and Computer Science, University of Hertfordshire, Hatfield, United Kingdom
| | - Arvind Tolambiya
- Applied Intelligence Hub, Accenture Solutions Private Ltd., Hyderabad, Telangana, India
| | - Florian Chambellant
- INSERMU1093, UFR STAPS, Université de Bourgogne Franche Comté, Dijon, France
| | - Jérémie Gaveau
- INSERMU1093, UFR STAPS, Université de Bourgogne Franche Comté, Dijon, France
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Monfredini CFP, Coelho DB, Marcori AJ, Teixeira LA. Control of interjoint coordination in the performance of manual circular movements can explain lateral specialization. Hum Mov Sci 2023; 90:103102. [PMID: 37236120 DOI: 10.1016/j.humov.2023.103102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 05/19/2023] [Accepted: 05/20/2023] [Indexed: 05/28/2023]
Abstract
Between-arm performance asymmetry can be seen in different arm movements requiring specific interjoint coordination to generate the desired hand trajectory. In the current investigation, we assessed between-arm asymmetry of shoulder-elbow coordination and its stability in the performance of circular movements. Participants were 16 healthy right-handed university students. The task consisted of performing cyclic circular movements with either the dominant right arm or the nondominant left arm at movement frequencies ranging from 40% of maximum to maximum frequency in steps of 15%. Kinematic analysis of shoulder and elbow motions was performed through an optoelectronic system in the three-dimensional space. Results showed that as movement frequency increased circularity of left arm movements diminished, taking an elliptical shape, becoming significantly different from the right arm at higher movement frequencies. Shoulder-elbow coordination was found to be asymmetric between the two arms across movement frequencies, with lower shoulder-elbow angle coefficients and higher relative phase for the left compared to the right arm. Results also revealed greater variability of left arm movements in all variables assessed, an outcome observed from low to high movement frequencies. From these findings, we propose that specialization of the left cerebral hemisphere for motor control resides in its higher capacity to generate appropriate and stable interjoint coordination leading to the planned hand trajectory.
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Affiliation(s)
| | - Daniel Boari Coelho
- University of São Paulo, Human Motor Systems Laboratory, São Paulo, Brazil; Biomedical Engineering, Federal University of ABC, São Paulo, Brazil.
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Zarandi Z, Adolfo Stucchi N, Fadiga L, Pozzo T. The effect of the preferred hand on drawing movement. Sci Rep 2023; 13:8264. [PMID: 37217537 DOI: 10.1038/s41598-023-34861-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Accepted: 05/09/2023] [Indexed: 05/24/2023] Open
Abstract
The observation that different effectors can execute the same movement suggests functional equivalences driven by limb independent representation of action in the central nervous system. A common invariant motor behavior is the speed and curvature coupling (the 1/3 power law), a low dimensional (abstract) descriptor of movement which is resilient to different sensorimotor contexts. Our purpose is to verify the consistency of such motor equivalence during a drawing task, by testing the effect of manual dominance and movement speed on motor performance. We hypothesize that abstract kinematic variables are not the most resistant to speed or limb effector changes. The results show specific effects of speed and hand side on the drawing task. Movement duration, speed-curvature covariation, and maximum velocity were not significantly affected by hand side, while geometrical features were strongly speed and limb dependent. However, intra-trial analysis performed over the successive drawing movements reveals a significant hand side effect on the variability of movement vigor and velocity-curvature relationship (the 1/3 PL). The identified effects of speed and hand dominance on the kinematic parameters suggest different neural strategies, in a pattern that does not go from the most abstract to the least abstract component, as proposed by the traditional hierarchical organization of the motor plan.
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Affiliation(s)
- Zinat Zarandi
- IIT@UniFe Center for Translational Neurophysiology of Speech and Communication, Istituto Italiano di Tecnologia, via Fossato di Mortara 17/19, 44121, Ferrara, Italy.
| | | | - Luciano Fadiga
- IIT@UniFe Center for Translational Neurophysiology of Speech and Communication, Istituto Italiano di Tecnologia, via Fossato di Mortara 17/19, 44121, Ferrara, Italy
- IIT@UniFe Center for Translational Neurophysiology, Section of Human Physiology, Istituto Italiano di Tecnologia, University of Ferrara, Ferrara, Italy
| | - Thierry Pozzo
- IIT@UniFe Center for Translational Neurophysiology of Speech and Communication, Istituto Italiano di Tecnologia, via Fossato di Mortara 17/19, 44121, Ferrara, Italy
- INSERM UMR1093-CAPS, UFR des Sciences du Sport, Université Bourgogne Franche-Comté, Dijon, France
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