Skip to main content

Table 2 Evolution of brain size during the evolution of H. floresiensis from four possible ancestors by insular dwarfism.

From: Reconstructing the ups and downs of primate brain evolution: implications for adaptive hypotheses and Homo floresiensis

Ancestor H. floresiensisbody mass (kg) Ratio of change in log(absolute brain mass) & log(body mass)2 Change in log(brain mass) Change in log(relative brain mass)
H. erectus 16 0.720* -0.398 -0.020*
  24 1.058 -0.398 -0.141
  32 1.586 -0.398 -0.226
Ngandong 16 0.784 -0.450 -0.058
  24 1.131 -0.450 -0.178
  32 1.649 -0.450 -0.264
Dmanisi 16 0.437* -0.216* 0.122*
  24 0.678* -0.216* 0.002*
  32 1.116 -0.216* -0.084
H. habilis 16 0.420* -0.137* 0.059*
  24 0.908 -0.137* -0.034
  32 5.219 -0.137* -0.147
  1. 1 computed as: [(brain descendant - brain ancestor)/(body descendant-body ancestor)]
  2. * indicates a result which falls within the range of decreases in brain size for Primates estimated in this study.