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67:(S1) but also in a second region adjacent to S1. In 1954, Penfield and Jasper evoked somatosensory sensations in human patients during neurosurgery by electrically stimulating the ceiling of the lateral sulcus, which lies adjacent to S1, and their findings were confirmed in 1979 by Woolsey et al. using
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Areas PV and S2 both map the body surface. Functional neuroimaging in humans has revealed that in areas PV and S2 the face is represented near the entrance to the lateral sulcus, and the hands and feet deeper in the fissure. Individual neurons in areas PV and S2 receive input from wide areas of the
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In monkeys, apes and hominids, including humans, region S2 is divided into several "areas". An area at the entrance to the lateral sulcus, adjoining the primary somatosensory cortex (S1), is called the parietal ventral (PV) area. Posterior to PV is the secondary somatosensory
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and electrical stimulation. Experiments involving ablation of the second somatosensory cortex in primates indicate that this cortical area is involved in remembering the differences between tactile shapes and textures.
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Woolsey CN, Erickson TC, Gilson WE (October 1979). "Localization in somatic sensory and motor areas of human cerebral cortex as determined by direct recording of evoked potentials and electrical stimulation".
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Ridley, R.M. and
Ettlinger, G. (1978). "Further evidence of impaired tactile learning after removals of the second somatic sensory projection cortex (S11) in the monkey".
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Ridley, R.M. and
Ettlinger, G. (1976). "Impaired tactile learning and retention after removals of the second somatic sensory projection cortex (S11) in the monkey".
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S2 is a part). Deeper in the lateral sulcus lies the ventral somatosensory (VS) area, whose outer edge adjoins areas PV and S2 and inner edge adjoins the
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Region S2 was first described by Adrian in 1940, who found that feeling in cats' feet was not only represented in the
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are densely interconnected, and stimulation on one side of the body will activate area S2 in both hemispheres.
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is green in the top left, and the supplementary somatosensory area is green in the bottom left.
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Adrian, ED (1940). "Double representation of the feet in the sensory cortex of the cat".
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S2" which designates the entire secondary somatosensory cortex, of which
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studies have found S2 activation in response to light touch, pain,
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In humans, the secondary somatosensory cortex includes parts of
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Eickhoff SB, Schleicher A, Zilles K, Amunts K (February 2006).
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142:and densely so with
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