Table 2

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

Ancestor

H. floresiensis body 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 computed as: [(brain descendant - brain ancestor)/(body descendant-body ancestor)]

* indicates a result which falls within the range of decreases in brain size for Primates estimated in this study.

Montgomery et al. BMC Biology 2010 8:9   doi:10.1186/1741-7007-8-9

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