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.
"Rates of evolutionary change in different early hominid groups during the same length of secular time, exhibited principally as differences in the rate of neotenous mutations --- among other factors --- are quite sufficient, it is suggested, to explain such apparent anachronisms as neanthropic types of man in the Middle or even Early Pleistocene and a palanthropic type of man in the Upper Pleistocene --- always, providing, of course, that we are also finally able to understand the adaptive value of these neotenous changes." (Montagu, Ashley (1955) Time, morphology, and neoteny in the evolution of man. American Anthropologist 57: pp. 27)
"The hypothesis advanced in this paper suggests that commencing with a single hominid ancestral population, which has subsequently separated into several geographically isolated populations, that in addition to such factors as mutation, natural selection, isolation, drift, and the like, neotenous mutations have played an important role in adding to the quanta of morphological difference among such populations. Neotenous mutations occurring at a more rapid rate in some early populations than in others would, at least in part, be responsible for the development of morphologically modernlike types of man at a period contemporary with the flourishing of such types of Pithecanthropus, Heidelerg, and Solo man. The hypothesis suggests that in the latter types neotenous mutations occurred comparatively infrequently." (Montagu, Ashley (1955) Time, morphology, and neoteny in the evolution of man. American Anthropologist 57: pp. 27)