Men often get concerned, as they age, about their testosterone levels dropping. But the hormone decline can also provide a window into men’s parenting.
A new University of Michigan study found that when men saw their infants in distress, it lowered their testosterone. That, as well as being empathic and having a loving relationship with the baby’s mother, predicted whether they were nurturing fathers.
Studies have shown that positive father involvement usually leads to positive child outcomes; sensitive and responsive fathering has been linked to young children’s social, emotional and cognitive development.
Previous research about fathers and testosterone has only looked at the play interactions between parent and child, which rarely elicits significant changes in testosterone. Fathers are often thought of as “assistants” or play partners.
Patty Kuo, the study’s first author and U-M psychology doctoral student, says, “A better trigger assessment is their own baby crying. For parents, infant cries are strong stimuli and can often elicit multiple types of emotional responses, including empathy, annoyance or aggravation.”
A crying infant can trigger certain emotions that may be accompanied by a corresponding hormonal response — empathy with decreased testosterone, or aggravation with increased testosterone.
The data involved 175 men whose spouse/partner was pregnant with their second child. Hormone tests (saliva samples) were collected during a laboratory visit to assess the father-infant interaction.
The father-infant groups participated in a videotaped activity in which the child was separated from the father for a short period and then later reunited. Infants often became visibly upset during the procedure, searching for the father during separations and seeking comfort from him upon the reunions.
Kuo believes that when watching their distressed infant, fathers’ empathy for their infants and the declining testosterone level shape how they respond. For example, if fathers interpret infant crying as a means of communicating distress and, therefore, empathize with the infant, some men will experience a decline in testosterone. This, in turn, facilitates a nurturing response.
Alternatively, when fathers interpret their baby’s crying as aggravating and feel they are unable to comfort the infant, they may experience increases in testosterone, which facilitates an intrusive or negative response to the infant.
To measure parental behaviors, fathers and infants completed a second task where they were presented with three toys in separate boxes, each with an instruction card. Fathers were asked to teach the infant to hit each key on a xylophone with a mallet, push all of the levers on an activity box and hit the shapes on a toy turtle’s back. Fathers were given five minutes for each toy.
“We then observed whether the men were sensitive or intrusive with their infants during these interactions,” Kuo said. “Men with larger declines in testosterone during the separation task were more sensitive fathers during the interaction.”
Men’s testosterone levels changed only during the separation from the infants, not in the interaction task, most likely because the men comforted and soothed their infants during the reunions, researchers said.
This study also indicated fathers behaved differently based on the infant’s gender. Specifically, fathers of daughters were more sensitive than fathers of boys.