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Summary: Fingertip Representation in the Human Somatosensory Cortex:
An fMRI Study
Patricia A. Gelnar,* Beth R. Krauss,* Nikolaus M. Szeverenyi, and A. Vania Apkarian*,
*Department of Neurosurgery, Department of Computational Neuroscience, and Department of Radiology,
SUNY Health Science Center, Syracuse, New York, 13210
Received August 19, 1997
Eight right-handed adult humans underwent func-
tional magnetic resonance imaging (fMRI) of their
brain while a vibratory stimulus was applied to an
individual digit tip (digit 1, 2, or 5) on the right hand.
Multislice echoplanar imaging techniques were uti-
lized during digit stimulation to investigate the organi-
zation of the human primary somatosensory (SI) cor-
tex, cortical regions located on the upper bank of the
Sylvian fissure (SII region), insula, and posterior pari-
etal cortices. The t test and cluster size analyses were
performed to produce cortical activation maps, which
exhibited significant regions of interest (ROIs) in all
four cortical regions investigated. The frequency of
significant ROIs was much higher in SI and the SII
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