#105 - Dr. Debra Lieberman: How Evolution Built Your Brain's Hidden Apps - Professor of Evolutionary Psychology, University of Miami

Dr. Debra Lieberman is a Professor of Psychology at the University of Miami, co-director of the Evolution and Human Behaviour Laboratory, and Editor-in-Chief of the journal Evolution and Human Behaviour. She holds a BS in Biochemistry from SUNY Binghamton and a PhD in Psychology from UC Santa Barbara's Centre for Evolutionary Psychology, where she trained under field founders Leda Cosmides and John Tooby. Her landmark research on human kin detection has been published in Nature, PNAS, Psychological Review, and Psychological Science, and her book Objection: Disgust, Morality, and the Law (Oxford University Press) examines how the emotion of disgust shapes our legal systems. She helps people understand the evolved mental programs that drive our emotions, relationships, and moral judgements through grounded, research-driven insights.

In this episode, you'll learn:

1. How your brain uses childhood cues to identify siblings - and why step-siblings trigger different levels of closeness depending on when they entered the family

2. The evolved purpose of gratitude and anger as tools for building friendships and signalling your social value - including why bullies and narcissists bypass gratitude entirely

3. Why social media exploits your evolved need for recognition and validation - and the specific "internal diagnostic check" you can run before opening the app

4. The three functions of disgust - food, contact, and sex - and how disgust gets weaponised in morality, law, and coalitional politics

5. How your mate preferences are shaped by early developmental templates - and why someone can tick every box on paper but still feel wrong

6. What evolutionary psychology reveals about sexuality, gender identity, and the biological variation behind human sexual development

This conversation features real clinical examples of how evolutionary psychology has helped people understand family dynamics, alongside practical insights into navigating social media and modern dating.

Disclaimer: This episode discusses topics including sexuality, gender identity, self-harm (in a clinical research context), and evolutionary perspectives on human behaviour. The views expressed reflect the guest's academic research and personal perspectives and should not be taken as medical, psychological, or legal advice. Listener discretion is advised.

If you enjoyed this episode, you might enjoy this:

https://www.youtube.com/playlist?list=PLMebuClQRf0_uXZRSNrXYQ9Wgp-Zk-0yk

Chapters

00:00:00 Intro, Debra Lieberman background & evolutionary psychology overview

00:05:06 Nature vs nurture, kinship cues & step-sibling dynamics

00:18:14 Social media shame, uncertainty & coalitional psychology

00:36:30 Gratitude, anger & social value signals

00:43:42 Narcissism, exploitation & can people change?

00:49:47 Trans development, sexuality variation & coalition targeting

01:00:33 Disgust: food, touch, sex, moral disgust & law

01:13:54 Dating apps, mate preferences & attraction templates

01:26:26 Closing, Lieberman Labs & final outro

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Dr. Debra Lieberman (University of Miami profile): https://people.miami.edu/profile/debra@miami.edu

Center for Evolutionary Psychology (UC Santa Barbara): https://www.cep.ucsb.edu/

Jonathan Haidt - "The Anxious Generation": https://www.anxiousgeneration.com/book

Joe Navarro - "Dangerous Personalities" (Amazon): https://www.amazon.com/Dangerous-Personalities-Profiler-Identify-Yourself/dp/1623361923

Debra Lieberman & Carlton Patrick - "Objection: Disgust, Morality, and the Law" (Amazon): https://www.amazon.com/Objection-Disgust-Morality-Debra-Lieberman/dp/0190491299