Role of Ipsilateral Motor Cortex in Executing Movements With Increasing Demand on Precision (RIMC)
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ClinicalTrials.gov Identifier: NCT01726218
Recruitment Status :
First Posted : November 14, 2012
Last Update Posted : October 15, 2018
National Institutes of Health (NIH)
National Institute of Neurological Disorders and Stroke (NINDS)
It is well known that the motor area of one hemisphere of the brain (motor cortex) controls the movement of the opposite of the body. However, it is not clear whether as the movement becomes more complicated, the motor cortex of both hemispheres of the brain are involved. Currently the role of the motor cortex on the same side of the body (referred to as ipsilateral motor cortex) in hand performance remains controversial. The investigators demonstrated previously in healthy subjects that transiently lowering the activity of ipsilateral motor cortex improved the performance of the opposite hand. What is not know are the mechanisms involved in these changes of behavior. Transcranial magnetic stimulation (TMS) is a device that allows the non- invasive stimulation of the brain. When brain is stimulated repetitively at a very low rate and low intensity for about 15 minutes, the stimulated brain area becomes less active. This effect lasts 10 minutes and is called a "transient artificial lesion" as it mimicks the effects of transiently interfering with the function of the stimulated brain area. In the present study the investigators will conduct experiments using repetitive TMS to downregulate the activity of the motor area as in previous experiments and measures its effect on activity of motor cortex of both hemispheres. The investigators will study healthy subjects. It would be important to understand the effects in more detail for the design of treatment strategies in patients after stroke, which will be a topic of future studies.
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Ages Eligible for Study:
18 Years to 80 Years (Adult, Older Adult)
Sexes Eligible for Study:
Accepts Healthy Volunteers:
30 Stroke patients with 15 in each group based on location of stroke 50 healthy volunteers
Inclusion Criteria for Stroke Patients:
Single cerebral ischemic infarction one month prior to entering study
Affecting only one hemisphere as defined by MRI of the brain
At the time of cerebral infarct a motor deficit of hand of Medical Research Council Scale for Muscle Strength (MRC) of < 4- of wrist and finger extension/flexion movement