Neural coupling of cooperative hand movements after stroke: role of ipsilateral afference

Schrafl-Altermatt, Miriam; Dietz, Volker

doi:10.1002/acn3.363

Cited by 9 publications

(12 citation statements)

References 18 publications

(20 reference statements)

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“…The device shown in Figure B (bottle) matches the condition for reflex studies performed previously in healthy (Dietz et al. ) and poststroke participants (Schrafl‐Altermatt and Dietz 2016a) as well as the condition used in SSEP studies in healthy (Schrafl‐Altermatt and Dietz ) and poststroke (Schrafl‐Altermatt and Dietz 2016b) participants. It mimics a bottle opening and closing movement that is performed by wrist flexion and extension movements.…”

Section: Methodsmentioning

confidence: 76%

“…A) during a resting condition and during three cooperative hand movement tasks. In all three movement tasks, a device similar to the one described previously was used (Schrafl‐Altermatt and Dietz , ,b; Dietz et al. ).…”

Section: Methodsmentioning

confidence: 99%

“…Recently, a task‐specific neural control of cooperative hand movements has been described in healthy (Schrafl‐Altermatt and Dietz ; Dietz et al. ) and poststroke participants (Schrafl‐Altermatt and Dietz ,b). During cooperative hand movements, both hands are linked over a kinematic chain.…”

Section: Introductionmentioning

confidence: 99%

“…This mechanism is reflected electrophysiologically in bilateral electromyographic (EMG) reflex responses in activated forearm muscles to unilateral arm nerve stimulation (Dietz et al. ; Schrafl‐Altermatt and Dietz 2016a) and a higher ipsi‐ to contralateral amplitude ratio of somatosensory evoked potentials (SSEPs) (Schrafl‐Altermatt and Dietz , 2016b) and by imaging (fMRI) in a stronger activation of the bilateral secondary somatosensory (S2) cortical areas during cooperative hand movements when compared to bimanual noncooperative tasks (Dietz et al. ).…”

Section: Introductionmentioning

confidence: 99%

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Cooperative hand movements: task-dependent modulation of ipsi- and contralateral cortical control

Schrafl-Altermatt

Easthope

2018

Physiol Rep

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Cooperative hand movements are known to be controlled by a task‐specific neural coupling associated with an involvement of the respective ipsilateral hemispheres. The aim of this study was to explore in how far this neural control applies to and is modulated during various, fine and gross, cooperative hand movements required during activities of daily living. Somatosensory evoked potentials and contralateral electromyographic reflex responses to unilateral ulnar nerve stimulation were simultaneously recorded in healthy participants during three different cooperative hand movement tasks and a resting condition. Amplitude ratio (ipsi‐/contralateral) of the somatosensory evoked potentials, which is a measure for the involvement of the ipsilateral hemisphere in movement control, was higher in all three movement tasks compared to resting. This ratio was highest during the fine cooperative movement studied here. Contralateral reflex responses, as a measure for the functional coupling of the arms, were elicited following stimulation of both arms during gross cooperative movements. However, such a response could only be elicited in the dominant arm during fine movement. It is concluded that the neural coupling and thus enhancement of ipsilateral cortical control is preserved through different cooperative hand movement tasks, independently whether fine or gross motor tasks are performed. However, modulation of cortical control can be observed as ipsilateral cortical control is stronger during fine movements and functional coupling of the arms more focused to the dominant hand compared to gross cooperative tasks.

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Section: Methodsmentioning

confidence: 76%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cooperative hand movements: task-dependent modulation of ipsi- and contralateral cortical control

Schrafl-Altermatt

Easthope

2018

Physiol Rep

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“…It appears that the shared sensory input from each hand to both hemispheres [5] is integrated and processed in S2 areas, which plays a key role in the task-specific neural coupling. In addition, increased amplitudes of ipsilateral somatosensory evoked potentials [6,7] indicate an involvement of ipsilateral and contralateral hemispheres in the neural coupling of cooperative hand movements.…”

Section: Introductionmentioning

confidence: 99%

Cooperative hand movements

et al. 2018

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The aim of this study was to evaluate the influence of unilateral reduction of afferent input on the 'neural coupling' mechanism during cooperative hand movements. This 'neural coupling' is reflected in the task-specific appearance of contralateral reflex responses in forearm muscles to unilateral arm nerve stimulation. Sensory input from the right hand was reduced by ischemic nerve block at the right wrist. Ipsilateral and contralateral reflex responses elicited by stimulation of the ulnar nerve either at the left or the right wrist proximal to the nerve block were recorded in forearm extensors during the performance of cooperative hand movements. During ischemia of the right hand, a significant difference was found in the magnitude of the contralateral responses, that is, contralateral reflex responses in the right arm were significantly higher compared with the left arm (P=0.04). Ipsilateral reflex responses were not affected by ischemic nerve block. The reduced afference from the ischemic hand during cooperative hand movements is assumed to weaken the activity in ipsilateral pathways involved in the neural coupling mechanism. Consequently, a shift in the interhemispheric balance might lead to the relative increase and decrease in the contralateral responses to left and right nerve stimulation, respectively. The study provides novel information on the involvement of ipsilateral hemispheres in the performance of cooperative hand movements.

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Cooperative hand movements in tetraplegic spinal cord injury patients: Preserved neural coupling

Scharfenberger

Schrafl-Altermatt

Dietz

2018

Clinical Neurophysiology

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Neural coupling of cooperative hand movements after stroke: role of ipsilateral afference

Cited by 9 publications

References 18 publications

Cooperative hand movements: task-dependent modulation of ipsi- and contralateral cortical control

Cooperative hand movements: task-dependent modulation of ipsi- and contralateral cortical control

Cooperative hand movements

Cooperative hand movements in tetraplegic spinal cord injury patients: Preserved neural coupling

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