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J Neurophysiol 88: 1400-1406, 2002;
0022-3077/02 $5.00
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The Journal of Neurophysiology Vol. 88 No. 3 September 2002, pp. 1400-1406
Copyright ©2002 by the American Physiological Society

Somatosensory Processing in the Human Inferior Prefrontal Cortex

Matthew C. Hagen,1,2,3 David H. Zald,4 Tricia A. Thornton,5 and José V. Pardo1,2,3

 1Cognitive Neuroimaging Unit, Veterans Affairs Medical Center, Minneapolis 55417;  2Department of Psychiatry, University of Minnesota Medical School, Minneapolis 55455;  3Graduate Program in Neuroscience, University of Minnesota, Minneapolis, Minnesota 55455; and  4Department of Psychology, and  5Neuroscience Graduate Program, Vanderbilt University, Nashville, Tennessee 37240

Hagen, Matthew C., David H. Zald, Tricia A. Thornton, and José V. Pardo. Somatosensory Processing in the Human Inferior Prefrontal Cortex. J. Neurophysiol. 88: 1400-1406, 2002. Three inferior prefrontal regions in the monkey receive afferents from somatosensory cortices: the orbitofrontal cortex (OFC), the ventral area of the principal sulcus, and the anterior frontal operculum. To determine whether these areas show responses to tactile stimuli in humans, we examined data from an ongoing series of PET studies of somatosensory processing. Unlike previous work showing ventral frontal activity to hedonic (pleasant/unpleasant) sensory stimulation, the tactile stimuli used in these studies had a neutral hedonic valence. Our data provide evidence for at least two discrete ventral frontal brain regions responsive to somatosensory stimulation: 1) the posterior inferior frontal gyrus (IFG) and adjacent anterior frontal operculum, and 2) the OFC. The former region (posterior IFG/anterior frontal operculum) may have a more specific role in attending to tactile stimuli.




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