Mental Models · Social

Coolidge Effect

Renewed interest in a stimulus when a novel stimulus is introduced.

"New options reawaken old appetites."

Quick answer

What is Coolidge Effect? Renewed interest in a stimulus when a novel stimulus is introduced. Novelty re-energizes engagement, for better and worse.

In the wild

A team loses steam on a project until a new competitor enters the market.

Why it matters in the room

Novelty re-energizes engagement, for better and worse.

Counter-move

Introduce small novelties to sustain momentum without constant pivots.

Visual · Pattern

Coolidge Effect — a recurring shape in how people decide.

Live example · Apply Coolidge Effect

Use the model. Pick the move.

Renewed interest in a stimulus when a novel stimulus is introduced. You've just seen this: A team loses steam on a project until a new competitor enters the market. Which lever does the model recommend?

● Live

Pick a lever. There are no neutral ones — every incentive funds a behavior somewhere.

How does this land?

Pick a reaction to Coolidge Effect

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Human Behavior Element™ · HBE Spec

The full taxonomy entry

Every concept in the Atlas uses the same structure — so Coolidge Effect can be compared, recombined, and cited like an element on a periodic table.

About the standard →

HBT-M7612

Official name

Coolidge Effect

Mental Models · Social

Identity

HBT ID

HBT-M7612

Symbol

Official name

Coolidge Effect

Synonyms

Social

Keywords

Mental Models, Social, human behavior, incentive design

Version

v1.0

Last updated

Maintained by The Incentives Lab

Classification

Kingdom

Cognition

Domain

Frameworks

Family

Mental Model

Class

Social

Element

Coolidge Effect

Definition

Scientific

Renewed interest in a stimulus when a novel stimulus is introduced.

Plain-English

Renewed interest in a stimulus when a novel stimulus is introduced.

Feynman

New options reawaken old appetites.

Core principle

Renewed interest in a stimulus when a novel stimulus is introduced.

One-sentence summary

Novelty re-energizes engagement, for better and worse.

Mechanisms

Psychological

Renewed interest in a stimulus when a novel stimulus is introduced.

Behavioral econ.

Novelty re-energizes engagement, for better and worse.

Neurological

Reward, threat, and salience circuits bias attention toward the cue.

Evolutionary

Heuristics that paid off in ancestral environments now misfire in modern systems.

Sociological

Group norms and status incentives reinforce the pattern across a team.

Computational

Models trained on biased human signals will replicate and amplify the pattern.

Systems thinking

Feedback loops between metrics, incentives, and behavior lock the pattern in place.

Signals & signature

Inputs (activators)

A team loses steam on a project until a new competitor enters the market.

Outputs (observable)

Novelty re-energizes engagement, for better and worse.

Behavioral signature

You see Coolidge Effect when the explanation for a decision sounds reasonable but the outcome keeps repeating.

Behavioral molecules

Often combines with related Atlas entries — see the rail below.

Pathways · before

A goal, metric, or contract clause makes the behavior rational locally.

Pathways · after

Locally rational choices accumulate into a systemic distortion.

Domains where it shows up

Business
Leadership
Government
Healthcare
Education
Sales
Marketing
AI
Negotiation
Media
Public Policy
Relationships

Examples

Everyday

A team loses steam on a project until a new competitor enters the market.

Modern

Novelty re-energizes engagement, for better and worse.

Historical

A pattern repeatedly documented since the foundational behavioral science literature on mental model.

Famous experiments

See the References block — primary papers in the Atlas link out to the original studies.

Design principles

How to leverage

Novelty re-energizes engagement, for better and worse.

How to reduce

Introduce small novelties to sustain momentum without constant pivots.

How to redesign

Introduce small novelties to sustain momentum without constant pivots.

The Perverse Incentive Lens™

How it's exploited

Organizations weaponize coolidge effect — sometimes deliberately, often by accident — when metrics reward the symptom rather than the outcome.

Common perverse incentives

Volume metrics, short review windows, bonus cliffs, and contracts that pay on activity rather than impact.

Failure modes

When Coolidge Effect dominates, teams optimize for the dashboard while the real outcome quietly degrades.

Incentive redesign

Introduce small novelties to sustain momentum without constant pivots.

Ethical considerations

Don't engineer coolidge effect into customers, employees, or citizens as a manipulation tactic — design for informed choice instead.

Diagnostic questions

Where in our org would Coolidge Effect most often show up unnoticed?
Which metric, ritual, or contract clause quietly rewards Coolidge Effect?
If we removed every payoff for Coolidge Effect, what behavior would replace it?
Who benefits when Coolidge Effect persists — and who pays the cost?

Organizational warning signs

Metrics

A KPI is hit while the underlying outcome stalls or worsens.

Behaviors

People route around the rule rather than challenge it.

Language

'That's just how we do it here.' / 'The system requires it.'

Culture

Naming the pattern is treated as disloyalty.

Red flags

People defend the status quo using the language of coolidge effect.
Decisions cluster around the easiest narrative rather than the strongest evidence.
New data changes the slide deck but not the decision.
Anyone naming the pattern is treated as the problem.

Intervention playbook

Immediate

Make the perverse payoff visible to the people creating it.

30-day

Run a small pilot that pays for the outcome, not the proxy.

Long-term

Rewrite the comp plan, contract, or ritual so the right behavior becomes the easy behavior.

AI considerations

Detect

Audit training data and reward signals for the same pattern this element describes.

Avoid amplifying

Don't optimize models on metrics that already encode the perverse incentive.

Counteract

Use the model to surface where the pattern is most active, then redesign the incentive — not the model.

Measurement

Metrics

Outcome-to-proxy ratio over time.

Assessment

The Incentives Lab III Diagnostic.

Survey

Calibrated pulse questions on rules vs. outcomes.

Behavioral signals

Where people work around the system.

Observational

Where the dashboard and the lived experience disagree.

Scientific evidence

Evidence grade

Synthesized from the behavioral science literature; see Atlas references.

Replication

Tracked in the Atlas as primary, replicated, or contested.

Intervention confidence

Moderate — patterns generalize, mechanisms vary by context.

Research consensus

Broad agreement on the pattern; ongoing debate on boundary conditions.

Known limitations

Local context, culture, and incentive structure all change the strength of the effect.

Open questions

How does Coolidge Effect interact with AI-mediated decisions at scale?

References

Primary papers

See the Research Center →

Books

Curated in the Magazine →

Meta-analyses

Tracked in the Atlas registry.

Seminal authors

Kahneman, Tversky, Thaler, Ariely, Cialdini, Ostrom, Simon — and the field they built.

Cross references

Every Atlas entry is a node in a knowledge graph. See the related rail below to follow the connections.

Disciplinary layers

See Coolidge Effect through 3 lenses

Each layer of the Incentives OS reframes this concept with its own thinkers, vocabulary, and diagnostic question.

Test yourself · 60 seconds

Do you actually know Coolidge Effect?

Three quick questions. Result is saved into your review streak — come back when the term is due to lock it in.

Question 1 of 3Score: 0/3

Which best describes Coolidge Effect?

Go deeper

Worked example, counter-example & concept map

On-demand AI analysis grounded in the Lab's research. Cached on your device after first run.

Diagnose

Find this pattern in your org →

15-minute III Assessment.

Learn

Master incentive intelligence →

12-week Executive Course.

Engage

Bring the Lab to your team →

Speaking, retainers, training.

How this lands in you

Your nervous system has a region for this.

Primary region

Default Mode Network →

When you encounter Coolidge Effect, your default mode network folds the experience into your ongoing story-of-self — which is why the same fact lands differently depending on who you think you are.

Self-referential thought, mind-wandering, narrative-of-self, mental time travel. Most of your waking thought is this network running scenarios about you, your status, your past, and your future.

See Default Mode in the Brain Atlas →