Participation of ipsilateral cortical descending influences in bimanual wrist movements in humans

Zhang, L.; Duval, Laura; Hasanbarani, Fariba; Zhu, Yutao; Zhang, X.; Barthélemy, Dorothy; Dancause, Numa; Feldman, Anatol G.

doi:10.1007/s00221-020-05899-4

Cited by 5 publications

(5 citation statements)

References 51 publications

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“…According to Equation 3, MNs of the wrist flexor muscle (FCR) would be facilitated by iCS when the ipsilateral wrist is in the flexed position (Figure 2). Thus, together with previous work (Zhang et al, 2020), our results imply that the iCS system, like the cCS system, is involved in parametric, referent control of wrist position by modulating cutaneous influences on MNs of wrist muscles. (Ahead of Print)…”

Section: Considering Results Based On the Notion Of Indirect Parametric Control Of Motor Actions And Sensory Influences By The M1supporting

confidence: 87%

“…Figure 3 shows that in contralateral muscles, TMS elicits a facilitatory short latency cMEP followed by a silent period (c) with a subsequent excitatory rebound (c). Similar EMG components (iMEP, ipsilateral silent period, and ipsilateral rebound) can be produced in response to iTMS in ipsilateral muscles (Chen et al, 2003;Zhang et al, 2020).…”

Section: Characteristics Of Cmeps and Imepsmentioning

confidence: 77%

“…For example, by changing the threshold muscle lengths of numerous body muscles, descending influences mediated by the vestibular system predetermine the body orientation in the gravitational field, for example, while leaning the body forward (Zhang et al, 2018). For bimanual wrist movements, Zhang et al (2020) showed that both iCS and cCS influences are involved in threshold control.…”

Section: Considering Results Based On the Notion Of Indirect Parametric Control Of Motor Actions And Sensory Influences By The M1mentioning

confidence: 99%

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Effect of Object Texture and Weight on Ipsilateral Corticospinal Influences During Bimanual Holding in Humans

et al. 2022

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We tested the hypothesis that the ipsilateral corticospinal system, like the contralateral corticospinal system, controls the threshold muscle length at which wrist muscles and the stretch reflex begin to act during holding tasks. Transcranial magnetic stimulation was applied over the right primary motor cortex in 21 healthy subjects holding a smooth or coarse block between the hands. Regardless of the lifting force, motor evoked potentials in right wrist flexors were larger for the smooth block. This result was explained based on experimental evidence that motor actions are controlled by shifting spatial stretch reflex thresholds. Thus, the ipsilateral corticospinal system is involved in threshold position control by modulating facilitatory influences of hand skin afferents on motoneurons of wrist muscles during bimanual object manipulation.

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Section: Considering Results Based On the Notion Of Indirect Parametric Control Of Motor Actions And Sensory Influences By The M1supporting

confidence: 87%

Section: Characteristics Of Cmeps and Imepsmentioning

confidence: 77%

Section: Considering Results Based On the Notion Of Indirect Parametric Control Of Motor Actions And Sensory Influences By The M1mentioning

confidence: 99%

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Effect of Object Texture and Weight on Ipsilateral Corticospinal Influences During Bimanual Holding in Humans

et al. 2022

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“…This is in contrast to a bimanual dual‐goal task, in which case both sides show the same level of disinhibition 18 . This control is likely coordinated through interhemispheric interactions 19 as well as the ipsilateral uncrossed corticospinal pathway 20 …”

Section: Discussionmentioning

confidence: 92%

Physiology of Tremor Reduction by Putting the Hands Together in Essential Tremor

McGurrin

Vial

Osterholt

et al. 2021

Movement Disord Clin Pract

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Background Essential tremor is a common movement disorder, characterized by 4–12 Hz tremor of the hands and arms that can affect many activities of daily living. It has been reported by patients that when performing tasks bimanually their tremor is reduced, but why this happens is unknown. Objectives We measured patients' tremors in different conditions when performed with 1 hand and 2 hands to observe if bimanual task performance changes the characteristics of the tremor. Methods A total of 10 patients with essential tremor participated in the study. Electromyographic electrodes were attached bilaterally to the wrist flexor and extensor muscles, and accelerometers were attached to the dorsum of the hands. For each condition, holding a cup, wingbeat, and extending both arms up, data were collected with a single hand and bimanually with the hands touching. Results When the hands were touching, there was a significant decrease in both accelerometric and electromyographic power at the tremor frequency. In addition, there was a decrease in coherence between accelerometer and electromyography on the same side. There was no change in the tremor frequency. Conclusions Tremor amplitude does decrease when the hands are together. Together, the characteristics underlying the decrease in tremor amplitude may indicate a decrease in power of the central oscillator driving the tremor, which we speculate is attributed to the differences in unimanual and bimanual motor control. However, given the small sample size, we note that future hypothesis‐driven studies with an a priori power analysis will be required to further explore this phenomenon.

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“…Still, the spontaneous postural sway makes these indices sensitive to both changes in neural control signals to the muscles and the time-varying contributions of reflex effects. Note that studies of APAs have not been limited to standing but also performed for postural tasks performed by a limb (Struppler et al 1993 ) and interpreted within the theory of control with RC (Zhang et al 2020 ).…”

Section: Discussionmentioning

confidence: 99%

Postural adjustments to self-triggered perturbations under conditions of changes in body orientation

et al. 2023

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We studied anticipatory and compensatory postural adjustments (APAs and CPAs) associated with self-triggered postural perturbations in conditions with changes in the initial body orientation. In particular, we were testing hypotheses on adjustments in the reciprocal and coactivation commands, role of proximal vs. distal muscles, and correlations between changes in indices of APAs and CPAs. Healthy young participants stood on a board with full support or reduced support area and held a standard load in the extended arms. They released the load in a self-paced manned with a standard small-amplitude arm movement. Electromyograms of 12 muscles were recorded and used to compute reciprocal and coactivation indices between three muscle pairs on both sides of the body. The subject’s body was oriented toward one of three targets: straight ahead, 60° to the left, and 60° to the right. Body orientation has stronger effects on proximal muscle pairs compared to distal muscles. It led to more consistent changes in the reciprocal command compared to the coactivation command. Indices of APAs and CPAs showed positive correlations across conditions. We conclude that the earlier suggested hierarchical relations between the reciprocal and coactivation command could be task-specific. Predominance of negative or positive correlations between APA and CPA indices could also be task-specific.

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Participation of ipsilateral cortical descending influences in bimanual wrist movements in humans

Cited by 5 publications

References 51 publications

Effect of Object Texture and Weight on Ipsilateral Corticospinal Influences During Bimanual Holding in Humans

Effect of Object Texture and Weight on Ipsilateral Corticospinal Influences During Bimanual Holding in Humans

Physiology of Tremor Reduction by Putting the Hands Together in Essential Tremor

Postural adjustments to self-triggered perturbations under conditions of changes in body orientation

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