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MENTAL MODEL · M3955

Pessimism Bias

Pessimism Bias
Learn & MetacognitionHigh supportCognitive Psychology
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Updated 2026-08-01

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INTRODUCTION

English translation pending.

CORE DEFINITION

A cognitive bias in which negative events are judged more probable or more damaging than the evidence supports. It is related to loss aversion, the availability heuristic and mood effects, and it is more pronounced in anxious individuals and after salient disasters. The core proposition is that perceived risk and actual risk diverge systematically in a pessimistic direction. The key qualification is that the bias is not the same as prudent risk assessment: it can be measured by comparing intuitive probability estimates against base rates, and it often coexists with unrealistic optimism about one's own risk.

SCAFFOLDING EFFECT

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- Risk calibration: compare felt probability against the base rate before deciding. - Opportunity scan: ask what upside is being discounted by excessive caution. - Mood check: separate a bad mood from a genuine change in the odds.

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Negative events are more memorable and more heavily weighted than positive ones, so they come to mind easily and are judged more likely. The mood states that accompany anxiety reinforce the estimate, and each avoidance behaviour removes the chance to learn that the feared outcome is rarer than assumed. The estimate therefore drifts further from the base rate the more the person acts on it.

MINIMUM ACTION

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Source support: Explicit

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