Chimpanzee Vocal Signaling Points to a Multimodal Origin of Human Language
Figure 3
Individual PET data for all 4 subjects.
Individual difference PET volumes (COM - RES) for subject 1 (S1), subject 2 (S2) - i.e. those subjects that produced AG vocalizations (AG+), and subject 3 (S3) and subject 4 (S4) - i.e. those subjects that did not produce AG sounds (AG-), overlaid on each subject’s individual MR brain image. Voxels in green indicate positive differences (i.e. metabolic activity is greater in COM vs. RES), whereas voxels in red indicate negative differences (i.e. metabolic activity is greater in RES vs. COM). Difference values of “0” as well as activation outside the region of interest are masked. Images are in transverse plane in serial 2 mm slices from ventral to dorsal as indicated in the figure.