Additionally, optimal testosterone levels contribute to improved concentration, memory, and cognitive performance. Beyond its physical effects, testosterone also influences various psychological traits that contribute to male success. This hormone is responsible for the greater muscle mass typically seen in males compared to females.
Previously, exogenous testosterone was found to increase dopamine levels in the rat ventral striatum , suggesting that the hormone exerts its effects through the modulation of dopaminergic activity in reward-related neural circuits. In both men and women we detected no effects of genetic variants related to testosterone on any aspect of socioeconomic position, or health, or risk-taking. In more than 300,000 adult participants of the UK Biobank, we identified genetic variants linked to higher testosterone levels, separately for men and women. Research has shown that testosterone levels can influence various aspects of social behavior, including assertiveness, confidence, and dominance.
LH then travels to your gonads and stimulates the production and release of testosterone. Your hypothalamus releases gonadotropin-releasing hormone (GnRH), which triggers your pituitary gland to release luteinizing hormone (LH). Your hypothalamus and pituitary gland control the amount of testosterone your gonads (testicles or ovaries) produce and release. Testosterone triggers the development of the male internal and external reproductive organs during fetal development. At around week seven in utero, the sex-related gene on the Y chromosome initiates the development of the testicles in male infants.
Afterward, participants were administered topical testosterone or placebo gel in a double-blind between-subjects design with random group allocation. The sample size was determined based on previous testosterone administration studies 8, 13, 32 and our pilot study. Moreover, as it has been suggested that sensitivity of dopaminergic pathways is heightened among highly dominant individuals and that these individuals show more pronounced effects of testosterone administration 27, 32, we tested whether testosterone effects on strategic prosociality vary as a function of self-reported trait dominance .
This way participants learned which symbol to choose to maximize the rewards in the long run. In addition, when participants were observed, a red frame was shown on their computer’s screen and the displays of the participants’ computers were transmitted onto the observers‘ laptop screens. The observers were seated at a desk with a laptop and had an equal view of all the participants. In the private condition, participants were informed that their performance is completely anonymous and no one (including the experimenter) would know how much money they would earn for themselves and the charitable organization. One hour and 50 min after the gel application, participants provided a second saliva sample and subsequently began the experimental task (see Fig. 1). Gel administration was followed by a 2-h waiting period, during which participants remained in the laboratory premises, completed personality and demographic questionnaires, and were offered leisure-time reading materials.