Functional Coupling of Cortico-Cortical and Cortico-Muscular Connections During Motor Movements: An Electrocorticographic Study of Ipsilateral Motor Control

This study has been completed.
Sponsor:
Information provided by:
National Institutes of Health Clinical Center (CC)
ClinicalTrials.gov Identifier:
NCT00036595
First received: May 10, 2002
Last updated: March 3, 2008
Last verified: May 2006
  Purpose

This study examines the relationship between a cerebral hemisphere and control of muscles on the same side of the body (ipsilateral control). One good way to study this relationship is to record electroencephalogram (EEG) activity directly from the cortical surface. Because patients with epilepsy who are surgical candidates are already undergoing monitoring with subdural and/or depth electrodes, they present an opportunity to study ipsilateral control. Studying the electrocorticographic (ECoG) activity associated with simple voluntary movement in such patients would not disturb ongoing monitoring of nearby areas of the brain, nor would it endanger the patients.

Ten patients, who may be children or adults, will be recruited for this study. Brain activity will be measured while they move the corner of their mouth and their fingers, wrists, arms, and feet. The baseline measurements will be done with scalp electrodes. Once subdural electrodes have been placed, a second set of measurements will be done. Surface EMG electrodes will be placed on the muscles whose movements are being tested. The tests will be done on no more than 3 separate days, in sessions no longer than 2 hours, for each patient.


Condition
Epilepsy

Study Type: Observational
Official Title: Functional Coupling Of Cortico-Cortical and Cortico-Muscular Connections During Motor Movements: An Electrocorticographic Study of Ipsilateral Motor Control

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Further study details as provided by National Institutes of Health Clinical Center (CC):

Estimated Enrollment: 20
Study Start Date: May 2002
Estimated Study Completion Date: May 2006
Detailed Description:

A corticomuscular functional relationship has been well addressed in the literature in terms of the control exerted by the primary motor region of the cerebral cortex over the contralateral extremities (Mima and Hallet 1999). However, the relationship between a cerebral hemisphere and ipsilateral motor control is not well understood. We hypothesize that a cortical motor control region ipsilateral to the extremities is located in Brodmann's area 6. There are several methods that can be used to study this relationship in terms of cortical region involved: coherence, correlation, and event-related desynchronization and synchronization. Cortical EEG activity associated with contralateral limb activity or stimulation usually is larger than that associated with ipsilateral limb activity. Furthermore, activity over the scalp that is ipsilateral to motor activity is very small and difficult to identify as compared with that occurring contralaterally. Recording responses directly from the cortical surface would improve the ability to identify this activity. An occasion that would allow us such an opportunity would be invasive monitoring in patients with epilepsy.

Epileptic patients who are surgical candidates, but require more precise localization of epileptogenic zones, typically undergo long-term video-EEG monitoring with subdural and/or depth electrodes. Some patients may have seizure onsets close to the sensory-motor area of the brain and require functional mapping in terms of motor function. We would like the opportunity to study electrocorticographic (ECoG) activity associated with simple movements in these patients who are undergoing invasive monitoring.

This study will not disturb ongoing monitoring, nor endanger the patient since no activation or stimulation is involved.

  Eligibility

Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No
Criteria

INCLUSION CRITERIA:

PATIENTS UNDERGOING SUBDURAL IMPLANTATION:

Epileptic patients who are undergoing invasive recording with implanted subdural electrodes that cover the sensorimotor cortices.

Therefore, we will recruit only those patients with medically intractable epilepsy who are candidates for surgical treatment, and in whom invasive monitoring was deemed necessary for the purpose of precise localization of epileptogenic zones.

EXCLUSION CRITERIA:

EPILEPTIC PATIENTS:

Patients whose electrode implantation does not cover the sensorimotor cortices.

  Contacts and Locations
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Please refer to this study by its ClinicalTrials.gov identifier: NCT00036595

Locations
United States, Maryland
National Institute of Neurological Disorders and Stroke (NINDS)
Bethesda, Maryland, United States, 20892
Sponsors and Collaborators
  More Information

Publications:
ClinicalTrials.gov Identifier: NCT00036595     History of Changes
Other Study ID Numbers: 020199, 02-N-0199
Study First Received: May 10, 2002
Last Updated: March 3, 2008
Health Authority: United States: Federal Government

Keywords provided by National Institutes of Health Clinical Center (CC):
Subdural
Epilepsy
Motor Function
Desynchronization
Coherence
Motor Control

Additional relevant MeSH terms:
Epilepsy
Brain Diseases
Central Nervous System Diseases
Nervous System Diseases

ClinicalTrials.gov processed this record on July 22, 2014