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Volume 17, Number 9,
Issue of May 1, 1997
pp. 3178-3184
Copyright ©1997 Society for Neuroscience
Transcranial Magnetic Stimulation during Positron Emission
Tomography: A New Method for Studying Connectivity of the Human
Cerebral Cortex
Received Jan. 9, 1997; revised Feb. 11, 1997; accepted Feb. 12, 1997.
Tomá Paus1,
Robert Jech2,
Christopher
J. Thompson1,
Roch Comeau1,
Terry Peters1, and
Alan C. Evans1
1 Montreal Neurological Institute, McGill University,
Montreal, Quebec, Canada H3A 2B4, and 2 Department of
Neurology, First Medical Faculty, Charles University, Prague, Czech
Republic
We describe a new technique permitting the mapping of neural
connections in the living human brain. The method combines two well
established tools of brain research: transcranial magnetic stimulation
(TMS) and positron emission tomography (PET). We use TMS to
stimulate directly a selected cortical area while simultaneously measuring changes in brain activity, indexed by cerebral blood flow
(CBF), with PET. The exact location of the stimulation site is achieved
by means of frameless stereotaxy. In the first study using this
technique, we found significant positive correlations between CBF and
the number of TMS pulse trains at the stimulation site, namely the left
frontal eye field (FEF) and, most importantly, in the visual cortex of
the superior parietal and medial parieto-occipital regions. The pattern
of these distal effects was consistent with the known anatomic
connectivity of the monkey FEF. We suggest that the combined TMS/PET
technique offers an objective tool for assessing the state of
functional connectivity without requiring the subject to engage in any
specific behavior.
Key words:
TMS;
PET;
FEF;
CBF;
saccades;
connectivity;
visual
cortex
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