Table 1.

Relative brain size in selected mammals

Species Relative brain size (EQ) Neurons in brain
Mouse 0.5 107
Monkey 2.09 109
Human 7.44 1011
  • Relative brain size is given in terms of encephalization quotient (EQ) (Jerison, 1973); data are taken from Macphail (Macphail, 1982). The estimates of neuron number in the brain are taken from Braitenberg (Braitenberg, 2001)