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.
"Indeed, Sprules (1974) demonstrated that low temperature or reduced food causes neoteny in another kind of salamander, Ambrystoma gracile, which lives in British Columbia. Neoteny is characterized by the increase in size of the larvae and the maturity of their gonad system, while metamorphosis ceases at the larval stage (Kollman, 19=882). If the functions of the endocrine systems concerning growth, metamorphosis, and reproduction depend on the temperature of the environment, and if there are differences in the temperature sensitivity among those endocrine systems, it is possible that such differences may cause the development of neoteny." (Moriya, Tsuneo (1983) The effect of temperature on the action of thyroid hormone and prolactin in larvae of the salamander Hynobius retardatus. General Comparative Endocrinology 49(1): pp. 1)