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How Genes Shape Your Risk Taking & Morals | Dr. Kathryn Paige Harden

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Feb 9, 2026

Guest

Kathryn Paige Harden

Dr. Kathryn Paige Harden, psychologist and behavioral geneticist at UT Austin and author of Original Sin, discusses how genes and upbringing shape risk-taking, impulsivity, addiction, and moral behavior. She covers puberty timing, sex differences in impulse control, genetics of antisocial behavior, ethical questions around genetic information, and how society balances responsibility, punishment, and rehabilitation.

02:42:17

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Episode notes

Contextualize Genetic Results For People

When offering genetic information, present it alongside observable family and personal phenotypes to avoid essentialist misinterpretation.
Develop responsible return-of-results practices that situate genes within context, not as isolated destinies.

23andMe Upended A Student's Family Story

A college student discovered via 23andMe that his fertility doctor was his biological father and found many half-siblings.
The revelation forced him to reconstruct his family story and identity.

Genes Raise Probability, Not Moral Fate

People often misinterpret genetic influence as making someone 'born bad,' which Harden argues is scientifically incorrect.
Genetic predispositions increase probabilities but do not determine moral character or destiny.

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Why study adolescence for genes and outcomes

03:11 • 50sec

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Defining adolescence and its developmental window

04:01 • 4min

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Pubertal timing, epigenetic clocks, and lifespan

08:16 • 5min

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Puberty, cognition and plasticity nuances

Family structure and puberty timing debates

16:34 • 3min

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Communicating sensitive genetic findings

19:22 • 3min

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Seven deadly sins reframed as disorders

22:45 • 5min

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Polygenic architecture and neurodevelopment

28:05 • 3min

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Mechanisms linking genes to addiction and impulsivity

31:08 • 5min

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Genes, trauma, and intergenerational risk

36:11 • 3min

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Should we return polygenic risk to people?

Genetic information can reshape identity

49:54 • 2min

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Are people born 'bad'—origins of moral narratives

52:12 • 3min

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Early-onset antisocial behavior and prognosis

55:32 • 10min

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Whitman case and biological causes of violence

01:05:16 • 7min

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Responsibility, bad luck, and accountability

01:11:50 • 3min

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Genetic recombination and breaking harmful cycles

Adaptive value of disagreeable traits

01:27:21 • 9min

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Relational aggression, sex differences, and development

01:36:30 • 8min

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Sex differences in sensation seeking and impulse control

Punishment, reward, and what works to change behavior

01:55:56 • 9min

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Cruelty as currency and enforcement of fairness

02:04:31 • 6min

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Forward-looking justice and cycle repair

02:10:13 • 7min

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Online outrage, group norms, and local action

02:17:19 • 12min

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Closing reflections and optimism

Original Sin: On the Genetics of Vice, the Problem of Blame, and the Future of Forgiveness

on the Genetics of Vice, the Problems with Blame, and the Future of Forgiveness

Kathryn Paige Harden

Original Sin is a revelatory inquiry into the intersection of human behavior and inherited biology, challenging traditional notions of vice, blame, and forgiveness. Acclaimed psychologist Kathryn Paige Harden examines the genetic influences on human traits, urging a more humane vision of moral responsibility and punishment. The book draws on scientific insights to rethink how society approaches accountability in light of genetic predispositions.

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One of us

Michael Marshall Smith

Dr. Kathryn Paige Harden, PhD, is a psychologist, behavioral geneticist and professor of psychology at the University of Texas at Austin. We discuss how genes interact with your upbringing to shape your level of risk-taking and morality. We also discuss how genes shape propensity for addiction and impulsivity in males versus females. Finally, we discuss how biology impacts societal views of sinning, punishment and forgiveness.

Read the episode show notes at hubermanlab.com.

Pre-order Protocols: https://go.hubermanlab.com/protocols

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Timestamps

(00:00:00) Kathryn Paige Harden

(00:03:10) Adolescents, Genes & Life Trajectory; Adolescence Ages

(00:06:44) Puberty, Aging & Differences; Epigenome; Cognition