ParkinsonCanadaV1, Main, Exploration, bibRecord, 003591

Coherence between cerebellar thalamus, cortex and muscle in man: Cerebellar thalamus interactions

Identifieur interne : 003591 ( Main/Exploration ); précédent : 003590; suivant : 003592

Coherence between cerebellar thalamus, cortex and muscle in man: Cerebellar thalamus interactions

Auteurs : J. F. Marsden [Royaume-Uni] ; P. Ashby [Canada] ; P. Limousin-Dowsey [Royaume-Uni] ; J. C. Rothwell [Royaume-Uni] ; P. Brown [Royaume-Uni]

Source :

Brain [ 0006-8950 ] ; 2000.

RBID : Pascal:00-0357151

Descripteurs français

Pascal (Inist)
- Tremblement, Pathogénie, Cortex sensorimoteur, Homme, Cervelet, Thalamus, Muscle strié, Electromyographie, Electroencéphalographie, Activité électrique, Exploration.
Wicri :
- topic : Homme.

English descriptors

KwdEn :
- Cerebellum, Electrical activity, Electroencephalography, Electromyography, Exploration, Human, Pathogenesis, Sensorimotor cortex, Striated muscle, Thalamus, Tremor.

Abstract

Local field potentials (LFPs) were recorded in seven unanaesthetized patients between the four adjacent contacts of a macroelectrode stereotactically implanted for the treatment of tremor. The LFPs were presumed to arise predominantly from the nucleus ventralis intermedius (Vim) of the thalamus, the implantation target. They were recorded simultaneously with the ipsilateral EEG and contralateral EMG during an isometric contraction or at rest. The patients had a history of either isolated tremor (essential tremor, n = 2; benign tremulous Parkinson's disease, n = 1) or tremor with signs of a cerebellar syndrome (multiple sclerosis, n = 3; essential tremor and ataxia, n = 1), although clinical tremor was absent at the time of recording because of a temporary microthalamotomy effect in four patients. In patients with isolated tremor, oscillatory activity picked up by contacts in Vim (cerebellar thalamus) was invariably coherent with that in the sensorimotor cortex or contracting muscle in the 8-27 Hz range. Such coherence was absent in two of the four subjects with tremor associated with a cerebellar syndrome. Coherence between LFPs recorded from more caudally placed contacts and the sensorimotor cortex or contracting muscle was negligible in all patients. These caudally placed contacts demonstrated the highest sensory evoked potential in response to median nerve stimulation. Oscillatory activity in the cerebellar thalamus (Vim) lagged behind that in both cortex and muscle. Coherent activity between the cerebellar thalamus (Vim) and the cortex persisted at rest. It is suggested that rhythmicities in the 8-27 Hz range could provide the basis for a temporal framework that is widely distributed within the motor system.

Affiliations:

Links toward previous steps (curation, corpus...)

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to stream PascalFrancis, to step Curation: 000040
to stream PascalFrancis, to step Checkpoint: 000C01
to stream Main, to step Merge: 003B35
to stream Main, to step Curation: 003591

Le document en format XML

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<front><div type="abstract" xml:lang="en">Local field potentials (LFPs) were recorded in seven unanaesthetized patients between the four adjacent contacts of a macroelectrode stereotactically implanted for the treatment of tremor. The LFPs were presumed to arise predominantly from the nucleus ventralis intermedius (Vim) of the thalamus, the implantation target. They were recorded simultaneously with the ipsilateral EEG and contralateral EMG during an isometric contraction or at rest. The patients had a history of either isolated tremor (essential tremor, n = 2; benign tremulous Parkinson's disease, n = 1) or tremor with signs of a cerebellar syndrome (multiple sclerosis, n = 3; essential tremor and ataxia, n = 1), although clinical tremor was absent at the time of recording because of a temporary microthalamotomy effect in four patients. In patients with isolated tremor, oscillatory activity picked up by contacts in Vim (cerebellar thalamus) was invariably coherent with that in the sensorimotor cortex or contracting muscle in the 8-27 Hz range. Such coherence was absent in two of the four subjects with tremor associated with a cerebellar syndrome. Coherence between LFPs recorded from more caudally placed contacts and the sensorimotor cortex or contracting muscle was negligible in all patients. These caudally placed contacts demonstrated the highest sensory evoked potential in response to median nerve stimulation. Oscillatory activity in the cerebellar thalamus (Vim) lagged behind that in both cortex and muscle. Coherent activity between the cerebellar thalamus (Vim) and the cortex persisted at rest. It is suggested that rhythmicities in the 8-27 Hz range could provide the basis for a temporal framework that is widely distributed within the motor system.</div>
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Coherence between cerebellar thalamus, cortex and muscle in man: Cerebellar thalamus interactions

Coherence between cerebellar thalamus, cortex and muscle in man: Cerebellar thalamus interactions

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri