This shows that language is innate in the human species. Although the capacity for language is instinctive, the particular language we each master is a function of experience. Verbal skills of infants and children can thus be improved by conversation. Intelligence T here are many areas of human intelligence, only one of which is measured by the IQ test. Brain size isn't everything, either.
Intelligence is based on speed, efficiency of use and memory capacity as well.
And all factors except brain size can be improved with proper stimulation. According to many studies, genes contribute about fifty percent towards a human's intelligence as measured by the IQ test. The remainder is environmentally determined. As Eliot writes, experience rewires the brain. Whether early in a baby's life or well into old age, active synapses and pathways continue to be strengthened, and inactive ones weakened, according to the sights, sounds, feelings, and events of daily life.