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Scientists map the Brain's speech decoder

NCT ID NCT05435859

Knowledge-focused Sponsor: University of California, San Francisco Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 investigates how the brain processes speech sounds to understand language. Researchers will record brain activity from people with epilepsy or brain tumors who already have electrodes implanted for medical reasons. Participants listen to short speech sounds while their brain signals are measured, helping scientists learn how basic sounds are linked into words and sentences.

What this could mean

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

What this could lead to
If successful, this research could reveal how the brain turns sounds into words, potentially improving treatments for language disorders.
What could go wrong
This is an observational study with a small group of participants, so findings may not apply to everyone. It aims to understand brain function, not to test a treatment.

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 60 people

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

Started

Aug 2022

Expected to finish

Jul 2027

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

18 to 70 years

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

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: * Participants with epilepsy or brain tumors at UCSF undergoing surgical electrode implantation for seizure localization or awake intraoperative brain mapping for resection of brain tumors or epilepsy and * Participants with electrodes implanted in at least two regions of interest who are willing and able to cooperate with study tasks. Exclusion Criteria: * Participants who lack capacity or decline to provide informed consent, * Participants who have significant cerebral lesions or * Participants with cognitive deficits that preclude reliable completion of study tasks.

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Conditions

The condition(s) this trial relates to.

brain cancer brain neoplasm epilepsy Speech speech disorder

As listed by the trial registrant

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

Brain tumor Epilepsy SPEECH

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

    The full official record for this study. This one lists no contact details, but it is the first place any would appear.

    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

  • University of California, San Francisco

    San Francisco, California, 94143, United States

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