Integration of Somatosensory Events in the Posterior Parietal Cortex of the Monkey
Information entering the somesthetic system through various receptors in various locations is kept rather separate on its way to the cortical projection areas. To serve behavioural purposes, e.g. localization and recognition of objects, information from separate parts of the somatosensory projection areas must be integrated and also compared with the information coming from other sensory organs. The posterior parietal cortex is a terminal for somesthetic association fibres originating in the postcentral gyrus and in the anterior wall of the Sylvian fissure (e.g. Pandya and Kuypers, 1969; Stanton et al., 1977; Seltzer and Pandya, 1980; Pandya and Seltzer, 1982). Additional somesthetic input may reach this area through motor (e.g. Pandya and Kuypers, 1969) and pre-frontal (e.g. Pandya and Kuypers, 1969; Mesulam et al., 1977) cortices, and limbic areas 23 and 24 (Mesulam. et al., 1977; Pandya et al., 1981). Somesthetic input may further be provided by transcallosal (Pandya et al., 1971) and rich intra-areal connections (Seltzer and Pandya, 1980; Pandya and Seltzer, 1982), and by fibres originating in some subcortical structures (e.g. Pearson et al., 1978).
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