... defined the prefrontal cortex as being the rostral part of the brain, the part of the cortex that receives fibres from the mediodorsal nucleus of the thalamus. Parcellation of the cerebral cortex into functionally distinctive areas is by no means unanimous (Crespo-Facorro, 1999). However some broad general areas have been discovered. These have been divided into the motor, premotor and prefrontal areas. The premotor area may also include the supplementary motor area on the lateral and medial surfaces of the cortex. The third are is the prefrontal cortex has many subdivisions within itself. These are classified as the dorsolateral prefrontal cortex, the inferior prefrontal cortex (including the orbital frontal cortex) and the medial frontal cortex. A recent MRI based parcellation method (Crespo-Facorro, 1999) used topographical features of the frontal cortex to produce a map that subdivides the area into 11 subregions. These are shown in Figure 1. The areas ...

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