"Women Are Furious About This Research." Why New Dads Suffer In Silence - Darby Saxbe

The 'Dad Brain' Phenomenon [00:25]

• Research shows new fathers lose gray matter volume, similar to mothers, but to a lesser extent.
• These brain changes are more variable and tied to the father's parenting experience and time investment.
• Dads who felt more bonded and spent more time with their babies showed the most significant brain changes.

  "So, the patterns look similar to those that have been observed in moms, and they seem to be of smaller magnitude."

Evolution of Modern Fatherhood [02:23]

• Father's daily time in parenting has tripled or quadrupled compared to the 1950s and 60s.
• The pandemic accelerated this trend, with millennial and Gen Z dads spending more time with children.
• This shift reflects changing societal expectations and increased paternal involvement.

  "So, by some estimates, dad's daily time in parenting has tripled or even quadrupled compared to the father knows best dads of the 50s and 60s."

Cross-Cultural Perspectives on Fatherhood [03:15]

• Hunter-gatherer societies like the Aka in Congo show high paternal involvement in infant care.
• Other societies, like the Keypigus, have strict prohibitions against men handling infants in the first year.
• Societal and cultural variability significantly shapes fatherhood roles and expectations.

  "So, in my book I talk about the a model of huntergatherer fatherhood, the aka which is a society in the Congo where men spend a lot of time within hands reach of infants and they're very involved in infant care."

Paternal Hormonal and Brain Changes [08:22]

• Fathers experience hormonal and emotional changes during their partner's pregnancy.
• Brain remodeling is thought to be driven by parenting experience and social demands.
• The brain's mentalizing network, crucial for empathy, is highly active in new dads.

  "So, we see hormone changes, we see new emotional worries and concerns, we see couple relationship changes, we see even sleep disruption that starts early before the baby's born."

The Role of Caregiving in 'Dad Brain' [18:00]

• Becoming a caregiver, not just a father, creates 'dad brain' through practice and repetition.
• Fathers' caregiving 'dial' can be turned up or down based on culture and context.
• Facultative adaptation allows fathers to develop sensitive caregiver abilities when needed.

  "Yeah. because it takes practice and repetition to build the brain just like anything you learn whether you're learning an instrument or a new language or you know you're a London taxi driver navigating the city."

Paternity Uncertainty and Pair Bonding [20:11]

• Human males' concealed ovulation incentivizes pair bonding and investment in courtship.
• This evolutionary strategy promotes stable relationships for raising offspring.
• Paternity uncertainty influences paternal investment and caregiving behavior.

  "So human males don't know for sure whether or not they've caused a pregnancy. So it actually incentivizes human males to invest in courtship because you can't just helicopter in, have sex once, and know that you've made a baby."

The 'Daughter Effect' and Paternal Behavior [53:21]

• Fathers of daughters may experience a greater drop in testosterone and report more parenting stress.
• They might also spend less time caring for daughters compared to sons.
• This suggests a need for additional preparation for fathers expecting girls.

  "So, we found that when men have daughters and this is from our longitudinal sample, they show more of a drop in testosterone across the transition to that parenthood."

Paternal Mental Health and Postpartum Depression [01:03:44]

• Fathers can experience increased vulnerability to mood disorders, with depression rates about double the general population.
• Paranatal depression is a more accurate term encompassing depression around childbirth for both parents.
• Stress, sleep disruption, relationship conflict, and identity crises are shared risk factors for paternal depression.

  "So in the book I say I think paranatal depression is a better word that just means around the birth of a baby."

Social Support and Resilience in Parenthood [01:13:53]

• Depressive symptoms in mothers and fathers are correlated, with partner support acting as a resilience factor.
• Increased paternal involvement, particularly through paternity leave, benefits maternal mental health.
• Social integration and strong support networks are crucial for mitigating postpartum depression risk for both parents.

  "So, you're telling me like that's brutal that any dad that's listening to this now knows the more that I care for my baby, the higher my likelihood of getting postnatal depression is."

The Mismatch Between Evolution and Modern Society [01:15:32]

• Postpartum depression in women may stem from an evolutionary-cultural mismatch, with modern society isolating parents.
• Hunter-gatherer societies offered more integrated community support for new mothers.
• Contemporary society's emphasis on productivity and individualism can exacerbate parental stress and isolation.

  "So, I actually think probably not. I think it's more of a sign of an evolutionary cultural mismatch, which is this going back to this idea that we as humans are cooperative breeders and we evolve to have a lot of support around caregiving."