Table 1.
Multivariate multiple regression, partial least squares, and covariance ratios between the spatial position of brain and neurocranial modules
| Pooled | Human | Chimpanzee | |
| MMR (r2) | |||
| All features | 0.628 (0.001) | 0.463 (0.001) | 0.678 (0.001) |
| Parietal region | 0.485 (0.001) | 0.362 (0.003) | 0.498 (0.122) |
| PLS (RV) | |||
| All features | 0.959 (0.001) | 0.836 (0.002) | 0.851 (0.006) |
| Parietal region | 0.937 (0.001) | 0.680 (0.073) | 0.833 (0.020) |
| CR (CR) | |||
| All features | 0.936 (0.001) | 0.718 (0.001) | 0.778 (0.001) |
| Parietal region | 0.869 (0.001) | 0.564 (0.001) | 0.626 (0.001) |
P values (inside parenthesis) represent the proportion of instances with higher r2 and lower RV and CR coefficients (ref. 36) observed in 1,000 random models. The sample sizes for the pooled, human, and chimpanzee samples are 65, 41, and 24 individuals, respectively. The RV coefficient ranges from 0 to 1, with higher values indicating higher covariation between modules. The CR coefficient ranges from 0 to positive values, with higher values indicating higher proportion of covariation between modules relative to the total amount of covariation within modules. The subset of 6 brain and 5 neurocranial features that comprised the modules used in the analyses of the parietal region is listed in SI Appendix, Table S1.