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Movement-Related Brain Networks Involved in Hand Dystonia

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00137384
Recruitment Status : Completed
First Posted : August 29, 2005
Last Update Posted : May 1, 2018
Information provided by (Responsible Party):
National Institutes of Health Clinical Center (CC) ( National Institute of Neurological Disorders and Stroke (NINDS) )

Brief Summary:

This study will use various methods to measure the activity of the motor cortex (the part of the brain that controls movements) in order to learn more about focal hand dystonia. Patients with dystonia have muscle spasms that cause uncontrolled twisting and repetitive movement or abnormal postures. In focal dystonia, just one part of the body, such as the hand, neck or face, is involved.

Patients with focal hand dystonia and healthy normal volunteers between 18 and 65 years of age may be eligible for this study. Each candidate is screened with a medical history, physical examination and questionnaire. Participants undergo the following procedures:

Finger Movement Tasks

Subjects perform two finger movement tasks. In the first part of the study, they move their index finger repetitively from side to side at 10-second intervals for a total of 200 movements in four blocks of 50 at a time. In the second part of the study, subjects touch their thumb to the other four fingers in sequence from 1, 2, 3 and 4, while a metronome beats 2 times per second to help time the movements. This sequence is repeated for a total of 200 movements in four blocks of 50 at a time.


This test records brain waves. Electrodes (metal discs) are placed on the scalp with an electrode cap, a paste or a glue-like substance. The spaces between the electrodes and the scalp are filled with a gel that conducts electrical activity. Brain waves are recorded while the subject performs a finger movement task, as described above.


MEG records magnetic field changes produced by brain activity. During the test, the subjects are seated in the MEG recording room and a cone containing magnetic field detectors is lowered onto their head. The recording may be made while the subject performs a finger task.


Electromyography (EMG) measures the electrical activity of muscles. This study uses surface EMG, in which small metal disks filled with a conductive gel are taped to the skin on the finger.

Magnetic resonance imaging

MRI uses a magnetic field and radio waves to produce images of body tissues and organs. The patient lies on a table that can slide in and out of the scanner (a narrow metal cylinder), wearing earplugs to muffle loud knocking and thumping sounds that occur during the scanning. Most scans last between 45 and 90 minutes. Subjects may be asked to lie still for up to 30 minutes at a time, and can communicate with the MRI staff at all times during the procedure.


This questionnaire is designed to detect any sources of discomfort the subject may have experienced during the study.

Condition or disease
Movement Disorder Focal Dystonia

Detailed Description:


Dystonia is a disabling movement disorder that manifests with sustained co-contraction of agonist and antagonist muscles, giving rise to abnormal twisted postures and overflow of muscle activity. Abnormal neurophysiologic parameters of the somatosensory and motor cortex have been demonstrated, although it is unclear how these changes lead to the predominant motor manifestations. In normal voluntary movement, communication between sensory and motor cortices is important and these interactions may be dysfunctional in dystonia. Coherence is a powerful method used to assess brain communication and has been instrumental in demonstrating the interregional interactions involved in normal movement. Inappropriate connectivity in terms of the duration of communication or the extent of spread over sensorimotor areas may give rise to the involuntary overflow of movements that characterize dystonia. We propose to examine changes in coherence associated with disorganized movements to yield insight as to the brain networks involved in the development and expression of the disease.

Study population

Patients with focal hand dystonia and normal volunteers will take part in the study.


In this study, EEG/MEG coherence analysis will be used to investigate corticocortical and corticomuscular interactions during voluntary hand movements in focal hand dystonia patients and normal subjects. Power spectral changes in the beta and alpha frequency range over the hand sensorimotor cortex will be studied using a 28-channel EEG montage while subjects perform various tasks involving the hand. The interregional coherence between sensory and motor, premotor and motor, and interhemispheric cortices will be assessed for changes between study populations.

Outcome Measures

Comparison of interregional coherence changes will be performed between dystonia patients and normal volunteers as well as between affected and unaffected sides. Furthermore, coherence changes will be compared between rest and during task performance.

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Study Type : Observational
Actual Enrollment : 60 participants
Time Perspective: Prospective
Official Title: The Role of Cortical Coherence in Focal Hand Dystonia
Study Start Date : August 25, 2005
Study Completion Date : April 27, 2018

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
  • Normal subjects: Healthy volunteers ages 18 and older who consent to participate in the study
  • Patients ages 18 and older diagnosed with focal hand dystonia unilateral focal hand dystonia who consent to participate in the study


  • Normal subjects: abnormal neurologic exam or history of previous neurological disease that might affect the functioning of the hands
  • Dystonia patients: presence of a second neurologic disease or condition that might affect the functioning of the hands; abnormal neurologic findings on exam not related to the focal hand dystonia that might affect the functioning of the hands; the use of Botulinum toxin within 3 months prior to study participation
  • For MRI studies, patients with metallic implants will be excluded to avoid potential risks from this procedure
  • For MRI studies, women who are pregnant are excluded from this part of the protocol. All women of childbearing potential will have a pregnancy test performed prior to MRI studies, which must be negative, before proceeding.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00137384

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United States, Maryland
National Institutes of Health Clinical Center, 9000 Rockville Pike
Bethesda, Maryland, United States, 20892
Sponsors and Collaborators
National Institute of Neurological Disorders and Stroke (NINDS)
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Principal Investigator: Mark Hallett, M.D. National Institute of Neurological Disorders and Stroke (NINDS)
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Responsible Party: National Institute of Neurological Disorders and Stroke (NINDS) Identifier: NCT00137384    
Other Study ID Numbers: 050228
First Posted: August 29, 2005    Key Record Dates
Last Update Posted: May 1, 2018
Last Verified: April 27, 2018
Keywords provided by National Institutes of Health Clinical Center (CC) ( National Institute of Neurological Disorders and Stroke (NINDS) ):
Functional Connectivity
Electroencephalogram (EEG)
Focal Hand Dystonia
Spectral Analysis
Healthy Volunteer
Additional relevant MeSH terms:
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Dystonic Disorders
Movement Disorders
Neurologic Manifestations
Nervous System Diseases
Central Nervous System Diseases