In the intricate web of human development, the role of parental presence and shared parenting policies has emerged as a pivotal factor influencing child well-being and societal health. Recent studies have shed light on the profound impact that parental involvement—or the lack thereof—can have on children, drawing parallels with findings in various animal species.

The Science of Memory and Decision-Making

The brain’s ability to process memory and make decisions is significantly affected by emotional responses, particularly during the formative years. For instance, neuroimaging scans reveal stark differences between the brains of normally developing children and those who have experienced severe neglect. These differences are not subtle; they are evident even to the untrained eye, underscoring the critical nature of a nurturing environment for healthy brain development.

Cross-Species Evidence

This phenomenon is not unique to humans. Research in animals, from birds to primates, has shown that parental absence can lead to heightened stress responses and behavioral changes. For example, in titi monkeys, separation from the father leads to increased adrenocortical activity, even if the mother remains. Similarly, in the monogamous and co-parenting California mouse, father absence impairs social behavior and alters neurotransmitter systems in the brain.

Shared Parenting as Prevention

Turning to human societies, the question arises: Can shared parenting policies prevent the adverse effects of childhood trauma and enhance well-being? The evidence suggests a resounding yes. Shared parenting, characterized by the involvement of both parents in a child’s life post-separation, has been shown to decrease conflict and positively influence well-being.

Case Studies and Research Findings

  • In Denmark and Sweden, where shared parenting is common, parental loss post-separation has significantly decreased.
  • French research indicates that the likelihood of parental loss drops to 1% with joint physical custody orders.
  • Studies from Tübingen University reveal a direct correlation between parenting time and the risk of parental estrangement.
  • Longitudinal studies in Australia observed a dramatic decrease in family court claims following the promotion of shared parenting laws.

The Debate: Selection Effect vs. Causal Effect

Critics argue that the positive outcomes associated with shared parenting may be due to a selection effect—parents who opt for shared parenting might inherently be more collaborative and better caregivers. However, the sudden increases in shared parenting in regions like Sweden and Catalonia suggest a causal effect, where changes in law and policy directly lead to better outcomes for children.


The evidence points to a clear conclusion: shared parenting not only mitigates the risk of adverse childhood experiences but also fosters a healthier society. The transformation seen in countries that have embraced shared parenting policies serves as a testament to the potential of legislative action to effect positive change.

As we continue to unravel the complexities of human development, the importance of shared parenting stands out as a beacon of hope for future generations. It is a call to action for policymakers, communities, and individuals alike to prioritize the well-being of children through supportive and inclusive parenting practices.

Dr. Vittorio VEZZETTI speaks from 5:38:12 to 5:58:15

dr. Vittorio VEZZETTI – Insubria Health Protection Agency, Varese, Italy – DOOR Conference 2021

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