Hemispheric laterality, high intelligence and twins

The authors analyze literature data concerning high correlation between hig h intelligence and high testosterone level in amniotic liquid in case of mo nozygotic male-twins pregnancy. They have put the hypothesis of biological conditioning of intellectual gift in monozygotic male-twins. Their own new experimental data as well as results of other investigators made them assum e that high involvement of right frontal cortex area in the current informa tional processing may serve as physiological marker of intellectual gift. P renatal development peculiarities and psyche-social factors of postnatal tw ins development are discussed as the reasons of phenomenological absence of talented male-twins in human history.