The brain responses of mothers and fathers are not so different

Key takeaways for caregivers

• Mothers and fathers show similar patterns of brain activity when exposed to stimuli from their infant.
• The observed brain changes occur in areas involved with reward, motivation, and empathy, and are associated with hormonal changes in moms and dads.
• Brain systems may reflect parental potential available to human fathers and other mammalian fathers when they are more involved in caregiving.

Fathers’ brains respond when they are exposed to stimuli from their baby

The neurobiology of fatherhood in humans seems to be similar to the neurobiology of motherhood, involving two brain systems – a “motivational” system that refers to the drive to nurture offspring, and an “empathy” system that refers to the ability to understand the thoughts and feelings of others.

Fathers shown pictures of their own newborns experienced more activation of empathy and reward systems than when shown pictures of unknown newborns.

For example, brain responses of mothers and fathers to pictures or videos of their infants overlap. Increased activity is found in parts of the brain associated with reward, motivation, and empathy. In one study, increased activity in brain reward systems also correlated with the father’s active engagement in caregiving, as reported by the mother.

In another study, fathers shown pictures of their own newborns experienced more activation of empathy and reward systems than fathers shown pictures of unknown newborns. In another study, a new father’s self-reported positive thoughts about his infant correlated with reward system activation in response to his infant’s cries. Future research will look at other brain responses in fathers – to children’s laughter, speech, and movements.

Brain changes are connected to hormonal changes activated by involved parenting

There is growing evidence that these changes are linked with the hormones that are produced when fathers care for their children. The key difference between human mothers and fathers is the degree of variability in fatherhood. After birth, most mothers are actively involved in parenting, but fatherhood is activated only when circumstances require or allow it, and even then it is highly variable.

When fatherhood is activated, neural processes take place in fathers that are similar to those in mothers.

In societies with small family units living apart from extended family networks and in families with scarce resources, paternal involvement is necessary. When fatherhood is activated, neural processes take place in fathers that are similar to those in mothers. It is as if a parental potential resides in all humans and is activated when circumstances require.

In the wild, fathers are actively engaged in caring for their young in only 5% of mammalian species (e.g., some primates, rodents, and canids, in particular). As in humans, this paternal behavior involves similar brain processes as those involved with maternal behavior. But when animals are held in captivity and in non-natural conditions, fathers can become more active. This suggests that parental brain systems may exist in many male mammals, and that they can be activated when an active paternal role is desirable or possible.