Cooperative hand movements

Thomas, Felix A.; Dietz, Volker; Scharfenberger, T.M.; Schrafl-Altermatt, Miriam

doi:10.1097/wnr.0000000000001012

Cited by 3 publications

(3 citation statements)

References 21 publications

(35 reference statements)

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“…The reflex behavior during bilateral finger movements was compared with that previously described for bilateral hand movements (Thomas, Dietz, Scharfenberger, et al, 2018). This task consisted of bilateral synchronous palmar hand flexion movements at a frequency of 1.33 Hz (acoustic signal of the metronome) while holding 0.5 kg dumbbells.…”

Section: Hand Movement Taskmentioning

confidence: 99%

“…bilateral reflex EMG responses to unilateral arm nerve stimulation. The size of reflex responses was shown to depend on the level of forearm muscle activity, that is, an increase in movement velocity or resistance results in greater background muscle activation and, consequently, in greater reflex amplitudes not only ipsi-but also contralateral to the stimulation site (Thomas, Dietz, Scharfenberger, & Schrafl-Altermatt, 2018).…”

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confidence: 99%

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Differential neural coordination of bilateral hand and finger movements

2020

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Cooperative hand movements (e.g., opening a bottle) require a close coordination of the hands. This is reflected in a neural coupling between the two sides. The aim of this study was to investigate in how far neural coupling is present not only during bilateral hand but also during bilateral finger movements. For this purpose unilateral mechanical and electrical nerve stimuli were delivered during bilateral sequentially and synchronously performed finger movements on a keyboard and, for comparison, during bilateral hand flexion movements. Electromyographic (EMG) activity and reflex responses in forearm flexor and extensor muscles of both sides were recorded and analyzed. Confounding EMG activity related to hand movements during the finger task was limited by wrist fixating braces. During the hand flexion task, complex reflex responses appeared in the forearm muscles of both sides to unilateral stimulation of the ulnar nerve (mean latency 57 ms), reflecting neural coupling between the two hands. In contrast, during the bilateral finger movement task, unilateral electrical nerve or mechanical stimulation of the right index finger was followed by dominant ipsilateral reflex responses (latency 45 and 58 ms, respectively). The results indicate that in contrast to the coupled hand movements, finger movements may not be coupled but can move independently on each side. Functionally this makes sense because during most activities of daily living, a close cooperation of the hands but not of individual fingers is needed. This independence of individual finger movements may rely on strong, specific, contralateral cortico‐motoneuronal control.

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Section: Hand Movement Taskmentioning

confidence: 99%

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confidence: 99%

Differential neural coordination of bilateral hand and finger movements

2020

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“…After stroke affecting the motor system, patients generally exhibit greater movement variability [ 16 ] and unsteady force control [ 17 ] during bilateral movements, regardless of the coordination patterns. Also, the interhemispheric balance between the two hemispheres as well as the laterality in ascending pathways showed changes during bilateral movements after stroke [ 18 , 19 ], indicating neural reorganization in bilateral movement execution [ 20 , 21 ]. Moreover, like healthy adults, stroke patients experience more difficulty performing anti-phase than in-phase movements [ 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

The impact of lesion side on bilateral upper limb coordination after stroke

Shih,

Steele,

Hoepfel

et al. 2023

J NeuroEngineering Rehabil

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Background A stroke frequently results in impaired performance of activities of daily life. Many of these are highly dependent on effective coordination between the two arms. In the context of bimanual movements, cyclic rhythmical bilateral arm coordination patterns can be classified into two fundamental modes: in-phase (bilateral homologous muscles contract simultaneously) and anti-phase (bilateral muscles contract alternately) movements. We aimed to investigate how patients with left (LHS) and right (RHS) hemispheric stroke are differentially affected in both individual-limb control and inter-limb coordination during bilateral movements. Methods We used kinematic measurements to assess bilateral coordination abilities of 18 chronic hemiparetic stroke patients (9 LHS; 9 RHS) and 18 age- and sex-matched controls. Using KINARM upper-limb exoskeleton system, we examined individual-limb control by quantifying trajectory variability in each hand and inter-limb coordination by computing the phase synchronization between hands during anti- and in-phase movements. Results RHS patients exhibited greater impairment in individual- and inter-limb control during anti-phase movements, whilst LHS patients showed greater impairment in individual-limb control during in-phase movements alone. However, LHS patients further showed a swap in hand dominance during in-phase movements. Conclusions The current study used individual-limb and inter-limb kinematic profiles and showed that bilateral movements are differently impaired in patients with left vs. right hemispheric strokes. Our results demonstrate that both fundamental bilateral coordination modes are differently controlled in both hemispheres using a lesion model approach. From a clinical perspective, we suggest that lesion side should be taken into account for more individually targeted bilateral coordination training strategies. Trial registration: the current experiment is not a health care intervention study.

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Neural coordination of bilateral power and precision finger movements

Dietz

2020

Eur J of Neuroscience

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The phylogenetic development of upper extremities for other tasks than locomotion represents the basis for the cultural achievement of human beings (Herder, 1785). Upright stance and gait allow the use of hands and fingers to perform a wide variety of voluntarily controlled tasks used in activities of daily life (ADL) or for cultural purposes. In most frequently performed ADL movements fingers act as part of the hand, that is, hand and fingers operate as a unity. This group of motor tasks comprises, for example, reaching and grasping an object. In contrast, in another group of tasks fingers move independently from the hand, such as picking up a raspberry. This requires a cortico-motoneuronal (CM) command in combination with a rapid feedback adaptation of finger forces applied to the berry.In motor tasks involving both hands, power grips can also be separated from precision movements. A typical example of a power grip task represents the opening of a bottle which requires a close cooperation of the two hands. Or lifting up

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Cooperative hand movements

Cited by 3 publications

References 21 publications

Differential neural coordination of bilateral hand and finger movements

Differential neural coordination of bilateral hand and finger movements

The impact of lesion side on bilateral upper limb coordination after stroke

Neural coordination of bilateral power and precision finger movements

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