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Contrasting Effects of Postcentral-Gyrus and Posterior Parietal-Lobe Excisions

Suzanne Corkin, PhD; Brenda Milner, PhD; Theodore Rasmussen, MD

Arch Neurol. 1970;23(1):41-58.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

ELECTRICAL stimulation of the cerebral cortex in conscious patients has shown the major cortical representation of somatic sensation to be in the postcentral gyrus, with a minor representation in the precentral gyrus.^1-4 On both sides of the rolandic fissure, the entire body form is represented in sequence, throat lying just above the fissure of Sylvius and toes at the midline. There is some debate, however, concerning the role of this central region in somatosensory discrimination, and the extent to which such discriminatory functions are focally represented in man's cortex.

Early clinical reports described patients with small unilateral cortical excisions who showed partial interference with sensory function in the corresponding body parts. Thus, van Valkenburg⁵ identified the postcentral hand area by electrical stimulation, excised a small amount of tissue there, and later observed a mild disturbance of light touch, pressure, two-point discrimination, and position sense in the . . . [Full Text PDF of this Article]

Author Affiliations
Montreal

From the Montreal Neurological Institute, McGill University, Montreal. Dr. Corkin is now with the Department of Psychology, Massachusetts Institute of Technology, Cambridge, Mass.

Footnotes
Submitted for publication Nov 26, 1969; accepted Dec 13.

Reprint requests to Montreal Neurological Institute, 3801 University St, Montreal 112, PQ (Dr. Milner).

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