Details
| Original language | English |
|---|---|
| Article number | 18493 |
| Number of pages | 9 |
| Journal | Scientific reports |
| Volume | 14 |
| Issue number | 1 |
| Early online date | 9 Aug 2024 |
| Publication status | E-pub ahead of print - 9 Aug 2024 |
Abstract
This study investigated how muscle synergies adapt in response to unexpected changes in object weight during lifting tasks. The aim was to discover which motor control strategies individuals use to maintain their grasping performance. Muscle synergies were extracted from the muscle activity of fifteen healthy participants who lifted objects of identical appearance but varying weights in a randomized order, which introduced artificial perturbations. Reaching and manipulation phases of object lifting were analyzed using constrained non-negative matrix factorization and k-means clustering. Participants exhibited a perturbation-independent and thus consistent recruitment of spatial synergy components, while significant adaptations in muscle synergy activation occurred in response to unexpected perturbations. Perturbations caused by unexpectedly heavy objects led to delayed and gradual increases in muscle synergy activation until the force required to lift the object was reached. In contrast, perturbations caused by lighter objects led to reductions in excess muscle synergy activation occurring later. Sensorimotor control maintains the modularity of muscle synergies. Even when external mechanical perturbations occur, the grasping performance is preserved, and control is adapted solely through muscle synergy activation. These results suggest that using pure spatial synergy components as control signals for myoelectric arm prostheses may prevent them from malfunctioning due to external perturbations.
Keywords
- External perturbation, Grasping performance, Motor control strategies, Muscle synergies, Myoelectric arm prostheses, Object lifting
ASJC Scopus subject areas
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In: Scientific reports, Vol. 14, No. 1, 18493, 12.2024.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Investigation of adaptive muscle synergy modulated motor responses to grasping perturbations
AU - Jakubowitz, Eike
AU - Schmidt, Leonard
AU - Obermeier, Alina
AU - Spindeldreier, Svenja
AU - Windhagen, Henning
AU - Hurschler, Christof
N1 - Publisher Copyright: © The Author(s) 2024.
PY - 2024/8/9
Y1 - 2024/8/9
N2 - This study investigated how muscle synergies adapt in response to unexpected changes in object weight during lifting tasks. The aim was to discover which motor control strategies individuals use to maintain their grasping performance. Muscle synergies were extracted from the muscle activity of fifteen healthy participants who lifted objects of identical appearance but varying weights in a randomized order, which introduced artificial perturbations. Reaching and manipulation phases of object lifting were analyzed using constrained non-negative matrix factorization and k-means clustering. Participants exhibited a perturbation-independent and thus consistent recruitment of spatial synergy components, while significant adaptations in muscle synergy activation occurred in response to unexpected perturbations. Perturbations caused by unexpectedly heavy objects led to delayed and gradual increases in muscle synergy activation until the force required to lift the object was reached. In contrast, perturbations caused by lighter objects led to reductions in excess muscle synergy activation occurring later. Sensorimotor control maintains the modularity of muscle synergies. Even when external mechanical perturbations occur, the grasping performance is preserved, and control is adapted solely through muscle synergy activation. These results suggest that using pure spatial synergy components as control signals for myoelectric arm prostheses may prevent them from malfunctioning due to external perturbations.
AB - This study investigated how muscle synergies adapt in response to unexpected changes in object weight during lifting tasks. The aim was to discover which motor control strategies individuals use to maintain their grasping performance. Muscle synergies were extracted from the muscle activity of fifteen healthy participants who lifted objects of identical appearance but varying weights in a randomized order, which introduced artificial perturbations. Reaching and manipulation phases of object lifting were analyzed using constrained non-negative matrix factorization and k-means clustering. Participants exhibited a perturbation-independent and thus consistent recruitment of spatial synergy components, while significant adaptations in muscle synergy activation occurred in response to unexpected perturbations. Perturbations caused by unexpectedly heavy objects led to delayed and gradual increases in muscle synergy activation until the force required to lift the object was reached. In contrast, perturbations caused by lighter objects led to reductions in excess muscle synergy activation occurring later. Sensorimotor control maintains the modularity of muscle synergies. Even when external mechanical perturbations occur, the grasping performance is preserved, and control is adapted solely through muscle synergy activation. These results suggest that using pure spatial synergy components as control signals for myoelectric arm prostheses may prevent them from malfunctioning due to external perturbations.
KW - External perturbation
KW - Grasping performance
KW - Motor control strategies
KW - Muscle synergies
KW - Myoelectric arm prostheses
KW - Object lifting
UR - http://www.scopus.com/inward/record.url?scp=85200921555&partnerID=8YFLogxK
U2 - 10.1038/s41598-024-68386-8
DO - 10.1038/s41598-024-68386-8
M3 - Article
C2 - 39122740
AN - SCOPUS:85200921555
VL - 14
JO - Scientific reports
JF - Scientific reports
SN - 2045-2322
IS - 1
M1 - 18493
ER -