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Sponsored by: |
National Institute of Neurological Disorders and Stroke (NINDS) |
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Information provided by: | National Institutes of Health Clinical Center (CC) |
ClinicalTrials.gov Identifier: | NCT00001661 |
The purpose of this study is to investigate the physiology associated with plasticity of the motor system. Plasticity refers to the process by which neighboring brain cells assume the responsibilities of damaged or diseased brain cells.
The mechanisms behind this process are unknown. However, researchers have several theories about how plastic changes take place. Possible explanations include the growth of new connections between brain cells and the use of previously unused connections.
Researchers plan to use transcranial magnetic stimulation and drug intervention in order to determine the mechanisms responsible for specific types of plasticity.
Previous studies have shown that certain drugs can affect the mechanisms involved in these changes. By using one drug at a time, researchers plan to evaluate the role of each of several different mechanisms in brain reorganization.
Condition |
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Blindness Cerebrovascular Accident Spinal Cord Injury |
Study Type: | Observational |
Official Title: | Mechanisms of Plasticity in the Human Motor System |
Estimated Enrollment: | 260 |
Study Start Date: | December 1996 |
Estimated Study Completion Date: | March 2002 |
The purpose of this study is to investigate the physiology associated with plasticity of the motor system seen in a number of different circumstances. Techniques used will involve the combination of transcranial magnetic stimulation (TMS) and pharmacologic interventions. We propose to use drugs judged to be safe, that either potentiate GABA related intracortical inhibition, change presynaptic release of excitatory aminoacids like glutamate, or decrease the activity of the NMDA receptors (mostly antiepileptic drugs). If plastic changes expressed as larger motor maps or motor evoked potentials (MEP) to TMS are secondary to intracortical disinhibition, administration of a drug that potentiates intracortical inhibition may result in decreased plasticity and smaller motor maps or MEP. This finding would then identify intracortical disinhibition as the mechanism responsible for this type of plasticity. Similarly, if plastic changes decrease with a drug that inhibits release of excitatory aminoacids, or that antagonize the action of NMDA receptors, the mechanism underlying plasticity is likely to be mediated by modulation in the release of excitatory aminoacids or activity in NMDA-receptors.
Results from this study will then provide information about the relative involvement of intracortical disinhibition, modulation in the release of excitatory aminoacids, and role of NMDA receptors in different settings of human plasticity.
Genders Eligible for Study: | Both |
Accepts Healthy Volunteers: | Yes |
Must be over 18 years of age.
Must not have personal history of seizures, loss of consciousness, hypertension, psychosis, heart conditions or allergies to any of the drugs.
Women must not be nursing or pregnant.
Patients may have amputations, spinal cord injuries, blindness or large hemispheric lesions from stroke.
Study ID Numbers: | 970048, 97-N-0048 |
Study First Received: | November 3, 1999 |
Last Updated: | March 3, 2008 |
ClinicalTrials.gov Identifier: | NCT00001661 |
Health Authority: | United States: Federal Government |
Plasticity Use Stroke |
Spinal Cord Injury Amputation Intracortical Inhibition |
Sensation Disorders Vision Disorders Cerebral Infarction Spinal Cord Diseases Eye Diseases Stroke Vascular Diseases Wounds and Injuries Central Nervous System Diseases Disorders of Environmental Origin Blindness |
Trauma, Nervous System Ischemia Brain Diseases Cerebrovascular Disorders Signs and Symptoms Spinal Cord Injuries Neurologic Manifestations Brain Ischemia Brain Infarction Infarction |
Nervous System Diseases Cardiovascular Diseases |