Brain Control of Blinking

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Total Enrollment

10 participants

Study Classification

OBSERVATIONAL

Study Start Date

2002-02-28

Study Completion Date

2004-02-29

Brief Summary

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This study will use transcranial magnetic stimulation (TMS) to study how the brain controls movement of muscles in the face-in particular, those involved in eye blinking. TMS is a procedure that activates areas of the brain with magnetic pulses that travel through the scalp and the skull.

Healthy normal volunteers 21 years of age and older may be eligible for this study. They must be free of any serious medical illness, have no neurological or psychiatric disorders or history of seizures, and must not be taking any medications that can affect nervous system function.

Participants will undergo TMS and the electrical activity in muscles activated by the stimulation will be recorded. For TMS, an insulated wire coil is placed on the patient's scalp, and a brief electrical current is passed through the coil. This creates a magnetic pulse that travels through the scalp and skull and causes small electrical currents in the outer part of the brain. If the coil is placed over a nerve that controls muscles, there may be a twitch in the muscles, sometimes large enough to move the face. In other cases, there may be a feeling of movement or tingling sensation in the face. Stimulation over the muscles on the side of the head may cause some discomfort there or twitching of the jaw. During the stimulation, subjects may be asked to tense certain muscles slightly or perform other simple actions.

Electrical activity of the muscles activated by the stimulation is recorded. This is done with both metal electrodes taped to the skin over the muscle and with fine needle electrodes inserted into the muscles around the eyes.

The study usually takes less than 3 hours, with frequent breaks. If more time is required, the study will be broken into more than one session.

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Detailed Description

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The purpose of this study is to investigate the cortical center for voluntary control of eyelid closure using transcranial magnetic stimulation (TMS). Conventionally the primary motor cortex (M1) has been thought to control upper facial movement . However, recent neuroanatomical and neuroimaging studies suggest that the upper facial muscles are mainly controlled by the mesial frontal region, not M1 . Recently, we performed a transcranial magnetic stimulation (TMS) study to investigate the cortical center for the upper facial muscles, especially those related to blinking, and observed possible cortical responses from the surface electrodes attached to the orbicularis oculi (OOC) muscles with the stimulation applied to the mesial frontal region. In this study, we are planning to use monopolar needle electrodes to confirm that these responses originate from the cortical stimulation.

Conditions

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Healthy

Eligibility Criteria

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Inclusion Criteria

EXCLUSION CRITIERIA:

Exclusion Criteria

who have a pacemaker;

an implanted medical pump;

a metal plate or a metal object in the skull or eye (for example, after brain surgery); or

who have a history of seizure disorder.

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes