Using magnetic resonance imaging to determine the volume of the frontal cortex in humans , all extant ape species and several monkey species , Semendeferi `` et al. '' found that the human frontal cortex was not relatively larger than the cortex of other great apes but was relatively larger than the frontal cortex of lesser apes and the monkeys .
Using magnetic resonance imaging to determine the volume of the frontal cortex in humans , all living ape species and several monkey species , Semendeferi `` et al. '' found that the human frontal cortex was not relatively larger than the cortex in the other great apes but was relatively larger than the frontal cortex in the lesser apes and the monkeys .