Testes Size Correlates With Men’s Involvement In Toddler Care
Smaller testicular amounts also correlate with more nurturing-related brain activity in fathers as they are looking at photos of their own children, the study shows. Emory anthropologist James Rilling, whose lab conducted the intensive research. The goal of the intensive research is to determine why some fathers invest more energy in parenting than others.
Evolutionary Life History Theory posits that advancement optimizes the allocation of resources toward either mating or parenting in order to maximize fitness. Jennifer Mascaro, who led the scholarly research as a post-doctoral fellow in the Rilling laboratory. While many economic, social, and cultural factors likely influence a father’s level of caregiving, the researchers wanted to investigate possible biological links.
They knew that lower degrees of testosterone in men have been correlated with better paternal involvement, and that higher levels of the hormone anticipate divorcing as well as polygamy. The testes, in addition to producing testosterone in men, produce sperm also. The analysis included 70 biological fathers who had a young child between your ages of 1 1 and 2, and who have been living with the kid and its biological mother. The parents were interviewed separately about the father’s involvement in hands-on childcare, including tasks such as changing diapers, feeding and bathing a child, staying home to care for a sick child or taking the young child to general practitioner appointments.
The findings showed that both testosterone levels and testes size were inversely correlated with the amount of immediate paternal caregiving reported by the parents in the analysis. As well as the father’s testes quantity also correlated with activity in the ventral tegmental area (VTA), a right area of the brain system associated with praise and parental motivation.
While testosterone levels may be more related to pre-copulatory, intrasexual competition, testicular volume may reveal post-copulatory mating investment, the experts theorize. Although statistically significant, the correlation between testes caregiving and size was not perfect. A key question raised by the scholarly study results is the path of casualty. Another important question is whether childhood environment can affect testes size. The scholarly research focused only on immediate paternal treatment, and not indirect forms of care, such as safeguarding children and earning a paycheck to provide for them. In the decades since the 1960s, the true variety of women raising children on their own in America has risen dramatically.
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