In vertebrates, this handicap is linked to testosterone, the primary male sex hormone, which is required for the production of many morphological sexual characters, and has a suppressive effect on the immune system (Zuk 1996).
By this he means a tendency to be less empathetic, to have restricted interests, and to be fascinated with how systems work, tendencies that Baron-Cohen hasaidid may be linked to prenatal testosterone exposure.
Metabolic syndrome in particular could be linked to subclinical testosterone deficiency.
Some violence perpetrated by fans of a winning team may also be linked to surges in testosterone and a feelings of invincibility fostered by soaring self-esteem, psychologists said.
These behavioural differences may be linked to differences in plasmatic testosterone levels between dominant and subordinate females, testosterone levels during late gestation being higher in dominant than in subordinate females [15].
Differences between our two sets of chicks may be linked to differences in yolk testosterone levels.
Men produce much more of this chemical than women, and testosterone levels may be linked to production of these molecules, the researchers suggest.
Sexual dimorphism may also be linked to other mechanisms of quality advertising through links with testosterone, which influences behaviour [36].
Secondary sexual characteristics may be linked to parasite resistance because the sex hormones which influence their growth, particularly testosterone, lower immuno-competence [32].
Sara S. Strom, the lead author of the study and an associate professor at the University of Texas, said scientific evidence suggested that obesity was linked to lower testosterone levels and higher insulin levels.
