Base Rate Neglect is we ignore underlying probabilities in favor of vivid specifics. It sits in the Cognition dimension (COG) of the Human Behavior Taxonomy™ as element HBT-COG-0085, within the Probability Bias family. The core principle: we ignore underlying probabilities in favor of vivid specifics. In incentive terms, it matters because it changes the payoff people perceive before they choose — which means it can be designed for, or exploited.
Scientific Definition
We ignore underlying probabilities in favor of vivid specifics.
Plain-English Definition
We ignore underlying probabilities in favor of vivid specifics.
Feynman Explanation
The story is true. The story is also rare. Both can be true.
Core Principle
We ignore underlying probabilities in favor of vivid specifics.
Mechanisms
We ignore underlying probabilities in favor of vivid specifics.
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Inputs (Triggers)
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Outputs (Behaviors)
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Behavioral Signature
The story is true. The story is also rare. Both can be true.
Examples
- Fearing a rare disaster while ignoring the common one happening right now.
- Risk programs that miss the modal failure while obsessing over the dramatic one.
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Original analysis from The Incentives Lab — how this element behaves inside real payoff structures.
Why this element matters to incentive design
This is one of the elements leaders describe as a values gap. It is a payoff gap. The mechanism underneath it is straightforward: we ignore underlying probabilities in favor of vivid specifics. You can recognize it in the field by its signature: the story is true. The story is also rare. Both can be true. Every element in the Cognition dimension changes the perceived payoff of an action before the action happens, which is exactly where incentive design has leverage.
How it gets exploited
Left undesigned, aI ethics worried about sci-fi scenarios; current-day misuse unaddressed. It is amplified whenever risk programs that miss the modal failure while obsessing over the dramatic one. Inside organizations that shows up as risk programs that miss the modal failure while obsessing over the dramatic one. The pattern is the same one Goodhart's Law describes: the measurable proxy attracts the effort, and the purpose behind it quietly loses funding.
How the Lab designs around it
The redesign move is to always state base rates alongside narratives. Watch for it at the boundaries: handoffs, promotions, incident reviews, and budget cycles are where this element gets its power.
Famous Experiments
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Design Principles
- Always state base rates alongside narratives.
Measurement Approaches
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Evidence
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The Perverse Incentive Lens™
How this behavior is exploited — and how to redesign around it.
- Always state base rates alongside narratives.
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Pending editorial review.
Interactive Mini Network
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Knowledge Graph Neighbors
Auto-linked to the rest of the Human Behavior Taxonomy by family, domain, dimension, and shared keywords.
We prefer known risks to unknown ones, even when the unknown is better.
Believing a specific scenario is more likely than its more general one.
Believing past random events influence future independent ones.
Believing streaks predict future streaks.
Underestimating the probability of bad outcomes — especially to us.
Overestimating the probability of bad outcomes.
Worst-cases assumed as base-cases because they 'feel responsible.'
We underestimate time and cost; we overestimate benefit.
We prefer eliminating a small risk completely over reducing a larger one partially.
Ignoring general statistics in favor of specific, vivid information.
Systematic deviations from rationality in judgment.
Doing something feels safer than doing nothing — even when nothing wins.
Where Base Rate Neglect is cited in the corpus
Essays, field guides, and diagnostics from The Incentives Lab that apply this element.
- EssayGoodhart's Law in the Real World
How measurable proxies capture judgment.
- EssayThe Perverse Incentives Hiding in Your KPIs
Cognitive shortcuts turned into scorecards.
- CourseIncentives 101
The free ten-part primer on reading a payoff structure.
- ReferenceThe incentive glossary
Definitions for every mental model, bias, and fallacy in the corpus.
- ReferenceThe Periodic Table of Human Behavior
The full 1,267-element map this page belongs to.
Questions about Base Rate Neglect
- What is Base Rate Neglect?
- Base Rate Neglect is we ignore underlying probabilities in favor of vivid specifics. It sits in the Cognition dimension (COG) of the Human Behavior Taxonomy™ as element HBT-COG-0085, within the Probability Bias family. The core principle: we ignore underlying probabilities in favor of vivid specifics. In incentive terms, it matters because it changes the payoff people perceive before they choose — which means it can be designed for, or exploited.
- What is an example of Base Rate Neglect?
- Risk programs that miss the modal failure while obsessing over the dramatic one. The Incentives Lab catalogs everyday, organizational, and historical instances of this element on its Human Behavior Taxonomy™ page (HBT-COG-0085).
- How is Base Rate Neglect exploited?
- AI ethics worried about sci-fi scenarios; current-day misuse unaddressed.
- How do you design around Base Rate Neglect?
- Always state base rates alongside narratives.
- Which behavioral dimension does Base Rate Neglect belong to?
- Base Rate Neglect is classified in the Cognition dimension (COG) of the Human Behavior Taxonomy™, family "Probability Bias", class "Cognitive Bias". Its permanent identifier is HBT-COG-0085 and its evidence grade is B.