ABSTRACT
This chapter describes the various subdivisions of the frontal lobe in order to find some unitary principle that unites them and anatomical data. It is concerned with reviewing and interpreting the mass of neurobehavioral data that deal with the functional parcellation of the anterior frontal systems. As with Caesar's Gaul, the frontal cortex of primates can be divided into three major parts, each of which is made up of subprincipalities. The three major divisions are the precentral, the anterior, and the cingulate. The dorsoventral terminations of the Rolandic projections reflect a lateral-medial origin from the thalamus; the dorsoventral terminations both forward and back of the peri-Rolandic cortex reflect a medial to lateral origin. Damage to both the medial and posterior orbital cortex does, however, produce a deficit in delayed-alternation performance. Orbital contribution to psychological processing is to provide a critical facility to the feeling of familiarity based on processing both interoceptive and exteroceptive inputs.
