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Locating the motor cortex on the MRI with transcranial magnetic stimulation and PET.

Abstract：

:Transcranial magnetic stimulation with a focal coil was used to map the cortical representation of a hand muscle in four healthy subjects. In each subject, the three-dimensional locations of the magnetic stimulation positions and about 400 positions on the surface of the head were digitized. The amplitude-weighted center of gravity of each subject's map was found, and a line perpendicular to the local head surface was projected inward. The digitized heads were registered with the subjects' MRIs using the scalp contours. The coordinate transformations yielded by this process were used to map the stimulation positions and the perpendicular line into the MRIs. Brain areas imaged with positron emission tomography (PET) and 15O-labeled water, activated by movement of the same muscle, were registered with the MRIs using the brain contours. In all cases, the magnetic stimulation lines encountered the surface of the brain at the anterior lip of the central sulcus and ran along the precentral gyrus a few millimeters anterior to the central sulcus, coming within 5-22 mm of all the PET activation maxima. This technique demonstrates the accuracy of transcranial magnetic stimulation for locating the primary motor area.

journal_name

Neuroimage

journal_title

NeuroImage

authors

Wassermann EM,Wang B,Zeffiro TA,Sadato N,Pascual-Leone A,Toro C,Hallett M

doi

10.1006/nimg.1996.0001

subject

Has Abstract

pub_date

1996-02-01 00:00:00

pages

1-9

issue

1

eissn

1053-8119

issn

1095-9572

pii

S1053-8119(96)90001-4

journal_volume

3

pub_type

杂志文章

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