Cognitive Scaffold

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MENTAL MODEL · M3800

False Consensus Effect

False Consensus Effect
BehaviorHigh supportSocial Psychology
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Updated 2026-08-01

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INTRODUCTION

English translation pending.

CORE DEFINITION

The false consensus effect, documented by Lee Ross and colleagues, is the egocentric bias by which people read their own choices as typical and infer that most others would choose the same. In the original studies, students who agreed to carry a sign around campus estimated that a majority would agree too, while those who refused estimated the opposite. The key qualifier is that the bias is strongest when the topic matters to the person and the reference group is vague, and it distorts estimates rather than the actual distribution.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

- User check: Treat your own reaction as one data point rather than a proxy for the market. - Alignment test: Force implicit agreement into explicit words and confirm it before acting. - Assumption audit: Name which beliefs you have never verified with anyone outside your own head.

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Anchor fast decisions

Estimating what others think requires a sample, and the most available sample is your own reasoning, which you can reconstruct in detail while other people's reasons stay opaque. You therefore generalize from a sample of one, weighted by how strongly you hold the position. Shared context makes this worse: inside a team or a bubble the people around you genuinely do agree, so local evidence keeps confirming a belief that does not hold outside.

MINIMUM ACTION

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Source support: Explicit

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    en.wikipedia.orghttps://en.wikipedia.org/wiki/False_consensus_effectZH · Explicit
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