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Study reveals how adults think about proportions

NCT ID NCT06762366

Knowledge-focused Sponsor: Michelle Hurst, PhD Source: ClinicalTrials.gov ↗

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Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
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Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
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The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

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Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

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Status unknown
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First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study tested whether adults use a mental shortcut (substitution heuristic) when comparing proportions. 442 participants judged which of two images had more of a target color. Some were given extra incentives or required to take more time. The goal was to understand how people reason about proportions, not to treat any disease.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

442 people

The number who actually took part.

Started

Dec 2024

Finished

Mar 2026

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 to 64 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Typically developing people within the target age range Exclusion Criteria: * Individuals with known developmental or cognitive disorders * Participants must speak/read sufficient English to read and complete the informed consent document

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As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Proportional reasoning Substitution heuristic

Contacts and locations

Locations

  • Rutgers Center for Cognitive Science

    Piscataway, New Jersey, 08854, United States

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