Table 3. Results of phylogenetic generalized least squares (PGLS) model averaging for lateralization direction (considering the inclusion and exclusion of humans) and strength.
Null models are shown in italics. Df. = degrees of freedom. AICc = second-order Akaike information criterion.
| A: PGLS model for lateralization direction, including humans | ||||
|---|---|---|---|---|
| Components | Df. | AICc | ΔAICc | Weight |
| Ecology | 3 | –13.60 | 0 | 0.28 |
| Ecology, tool use | 4 | –13.37 | 0.23 | 0.25 |
| Brain size | 3 | –12.22 | 1.38 | 0.14 |
| Ecology, brain size | 4 | –12.07 | 1.54 | 0.13 |
| Ecology, tool use, brain size | 5 | –10.87 | 2.73 | 0.07 |
| (NULL) | 2 | –10.37 | 3.23 | 0.05 |
| Tool use, brain size | 4 | –10.20 | 3.41 | 0.05 |
| Tool use | 3 | –9.48 | 4.12 | 0.04 |
| B: PGLS model for lateralization direction, excluding humans | ||||
| Components | Df. | AICc | Δ | Weight |
| Ecology | 3 | –30.60 | 0 | 0.37 |
| (NULL) | 2 | –29.37 | 1.23 | 0.20 |
| Ecology, brain size | 4 | –28.82 | 1.78 | 0.15 |
| Ecology, tool use | 4 | –28.01 | 2.59 | 0.10 |
| Tool use | 3 | –26.98 | 3.62 | 0.06 |
| Brain size | 3 | –26.97 | 3.63 | 0.06 |
| Ecology, tool use, brain size | 5 | –26.16 | 4.44 | 0.04 |
| Tool use, brain size | 4 | –24.42 | 6.18 | 0.02 |
| C: PGLS model for lateralization strength | ||||
| Components | Df. | AICc | ΔAICc | Weight |
| Ecology | 3 | –8.84 | 0 | 0.35 |
| Ecology, brain size | 4 | –7.85 | 0.99 | 0.21 |
| Ecology, tool use | 4 | –7.33 | 1.51 | 0.16 |
| (NULL) | 2 | –6.31 | 2.53 | 0.10 |
| Ecology, brain size, tool use | 5 | –5.46 | 3.38 | 0.06 |
| Tool use | 3 | –5.05 | 3.80 | 0.05 |
| Brain size | 3 | –4.14 | 4.71 | 0.03 |
| Tool use, brain size | 4 | –3.19 | 5.66 | 0.02 |