Scientists, in a large-scale study involving many people, have changed what was previously believed to be inherited from the father's genes, and have come to the conclusion that intelligence is inherited from the mother. The study found that the mother's genes are responsible for brain development, and the father's genes for limbic system or emotional development. Also, it is explained that maternal intelligence is inherited in humans because the intelligence gene is located on the X chromosome.

In addition, researchers from the University of Ulm in Germany have explained that higher intelligence is not only due to the mother's intelligence genes, but also to several additional factors. These things that affect human intelligence are also related to the mother, and in particular, it was concluded that children whose mother stays with them until the age of 2, play cognitive games together, and interact with them, become relatively wiser and more intelligent than their peers. Also, two important factors were found to be love and care, and it was shown that children who were not lacking in love, full of love and emotional connection until the age of 13 had 10% more brain hippocampal tissue formation and growth. As a result of this study, scientists believe that 40-60% of intelligence is inherited by genes, and the rest depends on the growing environment. He also warned that children who are smart from birth may lose their intelligence as they grow up if they are not developed with special attention to problem-solving skills.