NCT07226921

Brief Summary

This study aims to investigate how unimodal bilinguals who speak two languages and bimodal bilinguals who speak one language and sign another control languages across comprehension and production. Participants will complete different language tasks (e.g., classify a word, name a picture) in different languages, and their behavioral performance will be assessed, including accuracy and reaction time.

Trial Health

77
On Track

Trial Health Score

Automated assessment based on enrollment pace, timeline, and geographic reach

Enrollment
360

participants targeted

Target at P75+ for not_applicable healthy

Timeline
49mo left

Started Aug 2025

Longer than P75 for not_applicable healthy

Geographic Reach
1 country

1 active site

Status
recruiting

Health score is calculated from publicly available data and should be used for screening purposes only.

Trial Relationships

Click on a node to explore related trials.

Study Timeline

Key milestones and dates

Study Progress20%
Aug 2025Jul 2030

Study Start

First participant enrolled

August 6, 2025

Completed
3 months until next milestone

First Submitted

Initial submission to the registry

November 6, 2025

Completed
6 days until next milestone

First Posted

Study publicly available on registry

November 12, 2025

Completed
4.6 years until next milestone

Primary Completion

Last participant's last visit for primary outcome

May 31, 2030

Expected
2 months until next milestone

Study Completion

Last participant's last visit for all outcomes

July 31, 2030

Last Updated

November 12, 2025

Status Verified

September 1, 2025

Enrollment Period

4.8 years

First QC Date

November 6, 2025

Last Update Submit

November 7, 2025

Conditions

Healthy

Keywords

language controlbilingual adultsreaction time

Outcome Measures

Primary Outcomes (1)

  • Switch costs in different contexts

    An average of one year for each condition

Study Arms (4)

Predictable one-language production & both-language comprehension

EXPERIMENTAL
Behavioral: PredictabilityBehavioral: language context

Predictable both-language production & both-language comprehension

EXPERIMENTAL
Behavioral: PredictabilityBehavioral: language context

Unpredictable one-language production & both-language comprehension

EXPERIMENTAL
Behavioral: PredictabilityBehavioral: language context

Single language comprehension and production

NO INTERVENTION

Interventions

PredictabilityBEHAVIORAL

Whether the task of the next trial (comprehension or production) is predictable

Predictable both-language production & both-language comprehensionPredictable one-language production & both-language comprehensionUnpredictable one-language production & both-language comprehension
language contextBEHAVIORAL

whether both languages or only one language is involved in the current block

Predictable both-language production & both-language comprehensionPredictable one-language production & both-language comprehensionUnpredictable one-language production & both-language comprehension

Eligibility Criteria

Age18 Years - 65 Years
Sexall
Healthy VolunteersYes
Age GroupsAdult (18-64), Older Adult (65+)

You may qualify if:

  • Proficient in both Mandarin and English, or proficiency in both ASL and English

You may not qualify if:

  • Know a third language better than Mandarin/English or better than ASL/English
  • With language disorder or other neurological disorders

Contact the study team to confirm eligibility.

Sponsors & Collaborators

Study Sites (1)

UCSD

San Diego, California, 92037, United States

RECRUITING

Study Design

Study Type
interventional
Phase
not applicable
Allocation
RANDOMIZED
Masking
SINGLE
Who Masked
PARTICIPANT
Purpose
BASIC SCIENCE
Intervention Model
FACTORIAL
Sponsor Type
OTHER
Responsible Party
PRINCIPAL INVESTIGATOR
PI Title
Assistant Professor

Study Record Dates

First Submitted

November 6, 2025

First Posted

November 12, 2025

Study Start

August 6, 2025

Primary Completion (Estimated)

May 31, 2030

Study Completion (Estimated)

July 31, 2030

Last Updated

November 12, 2025

Record last verified: 2025-09

Locations

US(1)