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Stuff You Should Know
Stuff You Should Know

How Cognitive Biases Work

February 10, 2026 • 56m

Summary

⏱️ 10 min read

Overview

Josh and Chuck dive deep into cognitive biases and heuristics - the mental shortcuts our brains use that often lead us astray. They explore how Israeli psychologists Amos Tversky and Daniel Kahneman revolutionized our understanding of human decision-making, challenging the assumption that humans are rational actors. The discussion covers various biases from hindsight bias to confirmation bias, explains how these unconscious patterns affect everything from hiring decisions to medical diagnoses, and offers practical strategies for recognizing and overcoming these hardwired tendencies.

Introduction to Heuristics and Homeostasis

The episode begins by explaining how our brains use shortcuts called heuristics to return to homeostasis - a state of mental equilibrium that requires minimal energy. These shortcuts help us make quick decisions, like choosing a red apple over a brown mushy one based on past experience rather than detailed analysis. However, these mental shortcuts don't always lead to correct decisions, which is where cognitive biases emerge. This foundational concept sets the stage for understanding why humans consistently make predictable errors in judgment.

  • Homeostasis is your brain's desire to return to an even, normal state without exerting too much effort
  • Heuristics are mental shortcuts the brain uses to make decisions quickly and return to homeostasis faster
  • When heuristics lead to incorrect decisions by not accounting for all information, cognitive biases emerge
  • These are unconscious biases that are hardwired into humans, making them difficult to overcome
" all humans are dummies as far as cognitive biases go. It's not just you. And this stuff is hardwired into us because like I just said, we take mental shortcuts. "

The Revolutionary Work of Tversky and Kahneman

Israeli psychologists Amos Tversky and Daniel Kahneman developed groundbreaking research in the 1970s that challenged the prevailing belief that humans behave as rational actors. Working at Hebrew University of Jerusalem, they created the Heuristics and Biases Program to study how people make decisions without perfect information. Their collaboration, which began when Kahneman challenged Tversky's mathematical psychology theories, produced some of the most cited research in economics history and fundamentally changed how we understand human decision-making.

  • Tversky and Kahneman were Israeli psychologists who developed the concept of cognitive biases in the 1970s
  • Mathematical psychology previously promoted the false idea that humans behave as rational, self-interested actors
  • The two researchers created the Heuristics and Biases Program to study decision-making under imperfect conditions
  • Kahneman identified System 1 (quick, unconscious thinking) and System 2 (deliberate, conscious thinking)
" these are the people who came up with the crock idea that humans behave as rational actors. We're self-interested. We take all the best information available to make the best decision for ourselves. And Daniel Kahneman was like, this is not at all true. "

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