The Social Cortex
Group size increase with brain size. Human group size is predicted by Dunbar's model at about 150.
0
1
10
100
1000
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
Human group
size: 150
neo cortex ratio
mean group size
f
in
