Figure 3.

Total blood flow rate of both ICAs $({\dot{Q}}_{\mathrm{ICA}})$ in relation to (a) neocortical grey matter volume (V_grey) and (b) telencephalon volume (V_tele) in 17 species of extant haplorhine primates. ${\dot{Q}}_{\mathrm{ICA}}$ values calculated with the new empirical equation and w = 0.30 from ICA foramen radii in [6,13]. Volume data are from [17], which include data from [18,19]; duplicate or triplicate data were averaged to obtain one point for each species. The equations are, ${\dot{Q}}_{\mathrm{ICA}}=0.0135$ V_grey^{1.06±0.14 CI} (R² = 0.95) and ${\dot{Q}}_{\mathrm{ICA}}=0.0103$ V_tele^{1.01±0.12 CI} (R² = 0.96). Solid line is the regression mean; dashed lines represent the 95% confidence bands. See electronic supplementary material, table S4 for individual data. (Online version in colour.)