Table 2.
Anatomical definitions of homologous human and chimpanzee ROIs
| ROI | Chimpanzees |
Humans |
||
|---|---|---|---|---|
| Anatomical description | Cyto-architectonic region(s) | Anatomical description | Cyto-architectonic region(s) | |
| Lateral occipital cortex (LOC) | Its anterior border is a line drawn straight up from the occipital notch following the inferior extension of the STS. Its posterior border includes both the banks and the fundus of the lunate sulcus. It includes both banks of the medial parietooccipital fissure. | OA (BA 19) | Same, except its posterior border is a curved line placed half way to the pole. | BA 19 |
| Inferotemporal cortex (IT) | Lateral temporal cortex inferior to the superior central sulcus extending ventrally to the border with the hippocampal formation. Its anterior border is the temporal pole and its posterior border is an imaginary vertical line drawn up from the occipital notch. | TE1 (BA 21), TE2 (BA 20), PH (BA 37) | Same. | BA 21, BA 20, BA 37 |
| Superior temporal sulcus (STS) | Includes both banks and fundus. Its posterior border is the imaginary extension of the inferior terminus of the STS parallel to but anterior to the lunate sulcus. | Same, except its posterior termination is vertical line from occipital notch. | ||
| Inferior parietal cortex (IPL) | Its anterior border is the posterior bank of postcentral sulcus. Its posterior border is a vertical line drawn up from the termination of the inferior sulcus that extends off the posterior end of the STS. | PFD, PF (BA 40/7b), PG (BA 39/7a) | Its anterior border is the fundus of the postcentral sulcus. Its posterior border is vertical line drawn up from the occipital notch. | BA 40, BA 39 |
| Superior parietal cortex (SPL) | Its anterior border is the posterior bank of postcentral sulcus. Its posterior border is a vertical line drawn up from the termination of the inferior sulcus that extends off the posterior end of the STS. | PEm (BA 5), PEp (BA 5) | Its anterior border is the fundus of the postcentral sulcus. Its posterior border is a vertical line drawn up from the occipital notch. | BA 5, BA 7 |
| Primary and secondary somatosensory cortex (S1-S2) | Its anterior border is the fundus of the central sulcus. Its posterior border is the fundus of postcentral sulcus. | PB (BA 3, BA 1), PC (BA 2) | Same. | BA 3, BA 1, BA 2 |
| Primary motor cortex (M1) | Its posterior border is the fundus of the central sulcus. Its anterior border is an imaginary line drawn straight up from the intersection of the inferior frontal sulcus and the central sulcus. At its inferior aspect, the ROI exists entirely inside the central sulcus. At its superior aspect, the ROI extends past the dorsal precentral sulcus. | FA (BA 4) | Its posterior border is the fundus of the central sulcus. Its anterior border is a vertical line from the lateral sulcus to the superior tip of superior precentral sulcus. | BA 4 |
| Dorsal premotor cortex (PMd) | At its dorsal aspect, it extends anteriorly to an imaginary line drawn from the tip of the inferior precentral sulcus at a 90 degree angle with the lateral sulcus. The inferior part of the ROI is bordered anteriorly at the inferior frontal sulcus, curving down and back to meet the PMv ROI. The border between PMd and PMv is an imaginary line drawn parallel to the lateral sulcus at the dorsal tip of the frontooccipital sulcus so that the superior borders of PMv and Broca's area are continuous. | FB (BA 6), FC (BA 8) | Its posterior border is a vertical line from the lateral sulcus to the superior tip of the superior precentral sulcus. Its anterior border is a 45 degree line from the anterosuperior edge of the PMv ROI. The border between PMd and PMv is the gyrus that splits the superior and inferior precentral sulci. | BA 6, BA 8 |
| Ventral premotor cortex (PMv) | Bordered posteriorly by the M1/S1 ROI, superiorly as described above, and anteriorly by the inferior precentral sulcus. | FBA (BA 6) | Its anterior border is the inferior precentral sulcus. Its posterior border is a vertical line from the lateral sulcus to the superior tip of superior precentral sulcus (M1). Its superior border is the gyrus that splits the inferior and superior precentral gyri. | BA 6 |
| Dorsolateral prefrontal cortex (DLPFC) | Bordered dorsally by the interhemispheric fissure, posteriorly by the PMd ROI, inferiorly by the Broca's area ROI, and anteriorly by an imaginary line that is an extension of the orbital sulcus drawn past the tip of the middle frontal sulcus. | FDm (BA 9), FDδ (BA 46) | Its inferior border is the inferior frontal sulcus. Its anterior border is a 45 degree line drawn from tip of anterior horizontal ramus (the sulcus that borders the anterior edge of Broca's area). | BA 9, BA 46 |
| Ventrolateral prefrontal cortex (VLPFC) | Includes the pars opercularis and pars triangularis of the inferior frontal gyrus. Bordered posteriorly by the inferior precentral sulcus, anteriorly by the small sulcus that extends anteriorly from the frontoorbital sulcus, and superiorly by the inferior frontal sulcus. | FCBm (BA 44), FDp (BA 45) | Same. | BA 44, BA 45 |