Figure 4
The dependence of brain metabolism on body size and invertebrate species. A) The ratios of brain metabolism to resting body metabolism as a function of body mass (grams) for 7 ectotherms [25] were fit by y = 0.092×-0.102 (adjusted-R2 = 0.63, p < 0.05), and for 26 endotherms [25] which were fit by y = 0.0891×-0.0955 (adjusted- R2 = 0.231, p < 0.05), B). C. The average metabolic cost of an individual neuron for endotherms was 2.51 ±1.09 × 10−10 watts, and for ectotherms this cost was 0.563 ±0.03 × 10−10 watts [25]. The datasets used for this figure are given in Additional file 5: Table S5.