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Sensorimotor Regions

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Sanides argues that the highly differentiated primary sensorimotor areas are the most developed areas in the brain and thus represent the most recent stage in cortical evolution, whereas the association cortex is a “primitive” feature of the primate brain. However the dividing line between two developmental trends based on geodesic distance measurement includes both association and sensorimotor regions. In the transitional link between reptiles and mammals there must have developed from paleo and archicortex an expression of three sensory (somatosensory, auditory, visual) and one motor region with a higher specialized structure resulting in the refined sensory and motor representations and relationships with peripheral sense organs and muscles.

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