Human evolution theory utilizing concepts of neoteny & female sexual selection
An etiology of neuropsychological disorders such as autism and dyslexia, and the origin of left handedness.
"The major modification this produces in the sexual selection process is in the criteria for 'best genes' in the male. The one-male group species are most like the ungulates, with, or example, greater sexual dimorphism and special anatomical features for the male (the mane and 'cape' of the hamadyras for example). The multi-male species show less sexual dimorphism and specialisation, and capacities for group-living and organisation are obviously being selected for rather than mere strength or endurance or display. High-ranking female groups, for example, will often not tolerate males who are too aggressive and competitive, and these leave the group and become solitaries."(Fox, R (1983) Sexual selection, female choice and human kinship. Cambridge Anthropology 8,3: pp. 8)