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Can two weeks without your phone change your brain?

NCT ID NCT07663474

Knowledge-focused Sponsor: Pusan National University Hospital Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
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.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
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 Results may not be published yet.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)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
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.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

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

Summary

This study is testing what happens to dopamine transporters in the brain when people stop using their mobile phones for two weeks. Thirty healthy adults who own iPhones will have their phone use restricted, then undergo a PET scan to measure dopamine transporter levels. After that, they will use their phones freely for another two weeks and have a second PET scan. The goal is to see if limiting phone use changes brain chemistry related to addiction.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
Mobile phone restriction
What this could lead to
If it works, this could help us understand how smartphone use affects brain chemistry, potentially informing future addiction treatments.
What could go wrong
This is a small, early-stage observational study with only 30 participants. It measures a brain marker (dopamine transporter binding) rather than clinical outcomes, so real-world implications are uncertain.

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

About 30 people

The number the study aims to enrol. It can still change while the study runs.

Started

May 2026

Expected to finish

Dec 2030

An estimate. End dates often move.

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

19 to 40 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: * Healthy subjects with daily use of mobile phone (IPhone) * Accessible with "Screentime" application Exclusion Criteria: * Neuropsychiatric disease * Subjects who have medications for mental illness * Subjects who cannot undergo PET scans * Subjects who cannot participate 4 weeks of this study

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Conditions

The condition(s) this trial relates to.

Behavior, Addictive

As listed by the trial registrant

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

Addiction Smartphone owner

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Pusan National University Hospital

    RECRUITING

    Busan, Busan, 49241, South Korea

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