Figure 2.

Organization of complex movement zones in PPC of galagos 04-04L (A) and 04-07L (B) shown on the exposed dorsolateral surface of the brain. Cortical sites around the intraparietal sulcus (IPS) that were stimulated with 500-msec trains are marked as different color dots according to the evoked movement. Clusters of the same dots (movements) are outlined in the corresponding color. Dorsal PPC represents complex forelimb movements (defensive, green; hand-to-mouth, dark blue; reaching, light blue) that are arranged topographically (see text). Ventral PPC has posterior and anterior zones of complex face movements, representing defensive (yellow) and aggressive (purple) movements. More caudally, few stimulation sites represent eye movements (orange). The large black dots in the anterolateral region indicate sites where an eye blink was evoked. These sites were unique to case 04-04L and were not considered in the analysis. For each movement zone, the range of current thresholds for evoked movements is shown. Sites in motor cortex (small black dots) were stimulated with short 60-msec stimulus trains to produce simple movements that allowed us to locate motor and somatosensory cortex for reference. Dashed lines mark contours of sulci. bi, Bilateral; E, ear; FL, forelimb; FSp, posterior frontal sulcus; IPS, intraparietal sulcus; sh, shoulder; wr, wrist. Modified from Stepniewska et al. (2005a). Scale bars = 1 mm.