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The neocortex has four ‘‘primary’’ areas; each is the cornerstone of clusters of functionally related areas that include scores of higher-order areas that act as specialized processing centers. Three of the primary areas are sensory: the primary visual (V1), somatosensory (S1), and auditory (A1) areas, which process primary information received from the eye/retina (vision), body (somatosensation), and inner ear/cochlea (audition), respectively. The fourth primary area is motor (M1), which controls voluntary movement of body parts. |
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