Fig. 1.

Functional domains for ethologically relevant behaviors in prosimian galagos. Sensory and motor areas are outlined on a flattened view of the cortical surface of the brain. The mediolateral array of movement domains in the anterior half of posterior parietal cortex (PPC) is interconnected with matching domains in motor and premotor cortex (not shown). The domain for grasping (G) is partly or largely in area 2 of anterior parietal cortex, suggesting that part of this region is closely aligned with PPC. Domains for defensive movements of the face and arm (D) and reaching (R) are also shown. Motor areas include primary motor cortex (M1), dorsal and ventral premotor areas (PMD and PMV), the supplementary motor area (SMA), and the frontal eye field (FEF). Somatosensory areas include the primary area (S1 or area 3b), area 3a, area 1–2 (as separate areas 1 and 2 have not been distinguished), the second somatosensory area (S2), and the ventral parietal area (PV). Visual areas include V1, V2 and V3, dorsomedial (DM), dorsolateral (DL), middle temporal (MT), middle temporal crescent (MTc), middle superior temporal (MST), and inferior temporal (IT) areas. Representations of upper (+) and lower (−) visual quadrants are indicated for some visual areas. The auditory region includes primary auditory cortex (A1), the rostral area (R), and the auditory belt (AB). A dorsolateral view of a galago brain is on the lower left.