Investigations on maladaptive plasticity in the sensorimotor cortex of unilateral upper limb CRPS I patients

2019 ◽  
Vol 37 (2) ◽  
pp. 143-153 ◽  
Author(s):  
J. Pfannmöller ◽  
S. Strauss ◽  
I. Langner ◽  
T. Usichenko ◽  
M. Lotze
Keyword(s):  
Upper Limb ◽  
Sensorimotor Cortex ◽  
Maladaptive Plasticity

scholarly journals Effects of Focal Vibration over Upper Limb Muscles on the Activation of Sensorimotor Cortex Network: An EEG Study

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Wei Li ◽  
Chong Li ◽  
Quan Xu ◽  
Linhong Ji
Keyword(s):  
Upper Limb ◽  
Sensorimotor Cortex ◽  
Biceps Brachii ◽  
Central Area ◽  
Therapeutic Effects ◽  
Relative Power ◽  
Alpha Band ◽  
Beta Band ◽  
Muscle Belly ◽  
Limb Muscles

Studying the therapeutic effects of focal vibration (FV) in neurorehabilitation is the focus of current research. However, it is still not fully understood how FV on upper limb muscles affects the sensorimotor cortex in healthy subjects. To explore this problem, this experiment was designed and conducted, in which FV was applied to the muscle belly of biceps brachii in the left arm. During the experiment, electroencephalography (EEG) was recorded in the following three phases: before FV, during FV, and two minutes after FV. During FV, a significant lower relative power at C3 and C4 electrodes and a significant higher connection strength between five channel pairs (Cz-FC1, Cz-C3, Cz-CP6, C4-FC6, and FC6-CP2) in the alpha band were observed compared to those before FV. After FV, the relative power at C4 in the beta band showed a significant increase compared to its value before FV. The changes of the relative power at C4 in the alpha band had a negative correlation with the relative power of the beta band during FV and with that after FV. The results showed that FV on upper limb muscles could activate the bilateral primary somatosensory cortex and strengthen functional connectivity of the ipsilateral central area (FC1, C3, and Cz) and contralateral central area (CP2, Cz, C4, FC6, and CP6). These results contribute to understanding the effect of FV over upper limb muscles on the brain cortical network.

scholarly journals Cortical Oscillations in Cervical Dystonia and Dystonic Tremor

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Christopher W Hess ◽  
Bryan Gatto ◽  
Jae Woo Chung ◽  
Rachel L M Ho ◽  
Wei-en Wang ◽  
...  
Keyword(s):  
Upper Limb ◽  
Sensorimotor Cortex ◽  
Cervical Dystonia ◽  
General Pattern ◽  
Precision Grip ◽  
Head Movements ◽  
Therapeutic Interventions ◽  
Beta Band ◽  
Head Turning ◽  
Dystonic Tremor

Abstract Dystonia involves sustained or repetitive muscle contractions, affects different skeletal muscles, and may be associated with tremor. Few studies have investigated if cortical pathophysiology is impaired even when dystonic muscles are not directly engaged and during the presence of dystonic tremor (DT). Here, we recorded high-density electroencephalography and time-locked behavioral data in 2 cohorts of patients and controls during the performance of head movements, upper limb movements, and grip force. Patients with cervical dystonia had reduced movement-related desynchronization in the alpha and beta bands in the bilateral sensorimotor cortex during head turning movements, produced by dystonic muscles. Reduced desynchronization in the upper beta band in the ipsilateral motor and bilateral sensorimotor cortex was found during upper limb planar movements, produced by non-dystonic muscles. In a precision grip task, patients with DT had reduced movement-related desynchronization in the alpha and beta bands in the bilateral sensorimotor cortex. We observed a general pattern of abnormal sensorimotor cortical desynchronization that was present across the head and upper limb motor tasks, in patients with and without DT when compared with controls. Our findings suggest that abnormal cortical desynchronization is a general feature of dystonia that should be a target of pharmacological and other therapeutic interventions.

Assessment of reorganization in the sensorimotor cortex after upper limb amputation

2001 ◽  
Vol 112 (4) ◽  
pp. 627-635 ◽  
Author(s):  
Peter Schwenkreis ◽  
Katja Witscher ◽  
Frank Janssen ◽  
Burkhard Pleger ◽  
Roman Dertwinkel ◽  
...  
Keyword(s):  
Upper Limb ◽  
Sensorimotor Cortex ◽  
Limb Amputation ◽  
Upper Limb Amputation

Computer-aided training sensorimotor cortex functions in humans before the upper limb transplantation using virtual reality and sensory feedback

2017 ◽  
Vol 87 ◽  
pp. 311-321 ◽  
Author(s):  
Marek Kurzynski ◽  
Anna Jaskolska ◽  
Jaroslaw Marusiak ◽  
Andrzej Wolczowski ◽  
Przemyslaw Bierut ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Upper Limb ◽  
Sensorimotor Cortex ◽  
Sensory Feedback ◽  
Computer Aided

scholarly journals Early movement restriction leads to maladaptive plasticity in the sensorimotor cortex and to movement disorders

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Maxime Delcour ◽  
Michaël Russier ◽  
Francis Castets ◽  
Nathalie Turle-Lorenzo ◽  
Marie-Hélène Canu ◽  
...  
Keyword(s):  
Movement Disorders ◽  
Sensorimotor Cortex ◽  
Movement Restriction ◽  
Maladaptive Plasticity

Reflex Responses in Upper Limb Muscles to Cutaneous Stimuli

1993 ◽  
Vol 20 (04) ◽  
pp. 271-278 ◽  
Author(s):  
R. Chen
Keyword(s):  
Stimulus Intensity ◽  
Upper Limb ◽  
Healthy Subjects ◽  
Voluntary Contraction ◽  
Cutaneous Reflexes ◽  
Focal Lesions ◽  
Normal Ranges ◽  
Conduction Velocities ◽  
Limb Muscles ◽  
Biphasic Responses

ABSTRACT:Cutaneous reflexes in the upper limb were elicited by stimulating digital nerves and recorded by averaging rectified EMG from proximal and distal upper limb muscles during voluntary contraction. Distal muscles often showed a triphasic response: an inhibition with onset about 50 ms (Il) followed by a facilitation with onset about 60 ms (E2) followed by another inhibition with onset about 80 ms (12). Proximal muscles generally showed biphasic responses beginning with facilitation or inhibition with onset at about 40 ms. Normal ranges for the amplitude of these components were established from recordings on 22 arms of 11 healthy subjects. An attempt was made to determine the alterent fibers responsible for the various components by varying the stimulus intensity, by causing ischemic block of larger fibers and by estimating the afferent conduction velocities. The central pathways mediating these reflexes were examined by estimating central delays and by studying patients with focal lesions

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