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Classically, the agranular frontal cortex of the monkey and man has been considered to be formed by two motor areas: the primary motor area and the supplementary motor area. Evidence is presented that this subdivision is inadequate and that the agranular frontal cortex is constituted of at least seven different cortical areas. One of them (Fl) corresponds to the primary motor cortex. Two areas are located on the mesial cortical surface (F3 or “SMA-proper” and F6 or “pre-SMA”), two form the superior sector of area 6 (F2 and F7), and two form the area 6 inferior sector (F4 and F5). It is suggested that these various areas play a different role in motor control and that some of them (e.g. F4 and F5) are mostly involved in transforming visual object properties into motor acts, some (e.g. F2) are involved in proprioceptive control and proprioceptive representation of arm movements and finally some (F6) in decisions about movement initiation.
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