Force and time gain interact to nonlinearly scale adaptive visual-motor isometric force control

This study investigated the link between cognitive processes and neural structures involved in motor control. Children identified as clumsy through clinical assessment procedures were tested on tasks involving movement timing, perceptual timing, and force control. The clumsy children were divided into two groups: those with soft neurological signs associated with cerebellar dysfunction and those with soft neurological signs associated with dysfunction of the basal ganglia. A control group of age-matched children who did not exhibit evidence of clumsiness or soft neurological signs was also tested. The results showed a double dissociation between the two groups of clumsy children and the tests of timing and force. Clumsy children with cerebellar signs were more variable when attempting to tap a series of equal intervals. They were also more variable on the time perception task, indicating a deficit in motor and perceptual timing. The clumsy children with basal ganglia signs were unimpaired on the timing tasks. However, they were more variable in controlling the amplitude of isometric force pulses. These results support the hypothesis that the control of time and force are separate components of coordination and that these computations are dependent on different neural systems.

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The effect of mild whole-body cold stress on isometric force control during hand grip and key pinch tasks

Journal of Thermal Biology ◽

10.1016/j.jtherbio.2020.102537 ◽

2020 ◽

Vol 89 ◽

pp. 102537

Author(s):

Julie Renberg ◽

Øystein Nordrum Wiggen ◽

Juha Oksa ◽

Kristine Blomvik Dyb ◽

Randi Eidsmo Reinertsen ◽

...

Keyword(s):

Cold Stress ◽

Force Control ◽

Isometric Force ◽

Whole Body ◽

Hand Grip

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Effects of aging on motor control strategies during bimanual isometric force control

Adaptive Behavior ◽

10.1177/1059712319849896 ◽

2019 ◽

Vol 27 (4) ◽

pp. 267-275

Author(s):

Yan Jin ◽

JiWon Seong ◽

YoungChae Cho ◽

BumChul Yoon

Keyword(s):

Older Adults ◽

Motor Control ◽

Control Strategy ◽

Force Control ◽

Isometric Force ◽

Control Strategies ◽

Force Variability ◽

Dual Tasking ◽

Effects Of Aging ◽

Force Accuracy

Aging-induced degeneration of the neuromuscular system would result in deteriorated complex muscle force coordination and difficulty in executing daily activities that require both hands. The aim of this study was to provide a basic description of how aging and dual-task activity would affect the motor control strategy during bimanual isometric force control in healthy adults. In total, 17 young adults (aged 25.1 ± 2.4 years) and 14 older adults (aged 72.6 ± 3.4 years) participated in the study. The subjects were instructed to press both hands simultaneously to match the 1 Hz sine curve force under two conditions (with or without calculation) with continuous visual feedback. Differences in bimanual motor synergy, bimanual coordination, force accuracy, force variability, and calculation speed were compared. This study found that the specific motor control strategy of older adults involved a decreased bimanual force control ability with both increased VUCM and VORT, and was not influenced by dual tasking. These findings might have implications for establishing interventions for aging-induced hand force control deficits.

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Transient changes in paretic and non-paretic isometric force control during bimanual submaximal and maximal contractions

Journal of NeuroEngineering and Rehabilitation ◽

10.1186/s12984-020-00693-3 ◽

2020 ◽

Vol 17 (1) ◽

Author(s):

Hyun Joon Kim ◽

Nyeonju Kang ◽

James H. Cauraugh

Keyword(s):

Force Control ◽

Isometric Force

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Quantification of Upper Limb Isometric Force Control Abilities for Evaluating Upper Limb Functions among Prosthetic Users

IEEE Transactions on Neural Systems and Rehabilitation Engineering ◽

10.1109/tnsre.2021.3133539 ◽

2021 ◽

pp. 1-1

Author(s):

Jae Hyung Lee ◽

Ye Eun Oh ◽

Hyun Joo Lee ◽

Keehoon Kim ◽

Song Joo Lee

Keyword(s):

Upper Limb ◽

Force Control ◽

Isometric Force

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Motor control strategies during bimanual isometric force control among healthy individuals

Adaptive Behavior ◽

10.1177/1059712318822737 ◽

2019 ◽

Vol 27 (2) ◽

pp. 127-136 ◽

Cited By ~ 2

Author(s):

Yan Jin ◽

Minhee Kim ◽

Sejun Oh ◽

BumChul Yoon

Keyword(s):

Young Adults ◽

Motor Control ◽

Control Strategy ◽

Force Control ◽

Isometric Force ◽

Control Strategies ◽

Force Variability ◽

Force Level ◽

Target Force ◽

Motor Synergy

This study aimed to provide a basic description of the motor control strategy during bimanual isometric force control in healthy young adults. Thirty healthy young adults (mean age: 27.4 ± 3.7 years) participated in the study. The subjects were instructed to press both hands simultaneously to match the target force level of 5%, 25%, and 50% bimanual maximum voluntary force using continuous visual feedback. Bimanual motor synergy and bimanual coordination, as well as force asymmetry, force accuracy, and force variability were compared. This study identified the specific motor control strategy of healthy young adults during bimanual isometric force control, indicating that they proportionally increased “good” and “bad” variabilities, resulting in comparable bimanual motor synergy as the target force level increased.

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