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Lesson 10 min 20 XP

The Affect Heuristic

How our emotional reactions substitute for careful analysis, causing us to judge risks and benefits based on how we feel rather than what we know.

When Feelings Replace Facts

The affect heuristic, identified by psychologist Paul Slovic, describes how people make judgments based on current emotions rather than deliberate analysis. If something feels scary, we judge it as high-risk. If something feels good, we judge it as low-risk and high-benefit. The emotional tag attached to a concept substitutes for a careful cost-benefit analysis.

Nuclear power is the classic example. Despite being one of the safest energy sources by deaths-per-kilowatt-hour (far safer than coal, oil, or even hydroelectric), nuclear power is perceived as extremely dangerous because it triggers fear. The emotional association with Chernobyl, Fukushima, and nuclear weapons overwhelms the statistical reality.

The Affect Heuristic | Model Diplomat