Fig. 2.
Continuous independent variables considered as predictors of time to walking onset. Time to walking onset, log(WO), is shown as a function of absolute adult brain mass, log(AbsBrM), neonatal brain mass, log(NeoBrM), gestation time, log(Gest), adult body mass, log(BoM), brain advancement at birth (neonatal brain mass/adult brain mass), log(BrAdv), and adult relative brain mass (adult brain mass/body mass), log(RelBrM). PC, postconception; g, grams; d, days. Sample is shown as in Tables S1 and S2. Double circle, humans; dotted circles (in BoM and RelBrM), nonhuman primates; solid lines, model II linear regression (reduced major axis) on all species. R2 and P values for linear regressions are given in diagrams.