Recruiting

Bilingualism Investigation

Sponsor:

UCLA

Code:

NCT07226921

Conditions

Healthy

Eligibility Criteria

Sex: All

Age: 18 - 65

Healthy Volunteers: Accepted

Interventions

Predictability

language context

Study Details

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.

Conditions

Healthy

Study ID

NCT07226921

Start date

Aug 6, 2025

Status verified date

Sep, 2025

Completion date

Jul 31, 2030

Anticipated

Primary completion date

May 31, 2030

Anticipated

Eligibility Criteria

Eligibility Criteria

Sex: All

Age: 18 - 65

Healthy Volunteers: Accepted

Inclusion Criteria:

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

Exclusion Criteria:

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

Study Design

Enrollment

360 participants

Anticipated

Allocation

Randomized

Intervention Model

Factorial

Primary purpose

Basic Science

Interventions and Outcome Measures

Arms

experimental: Predictable one-language production & both-language comprehension

experimental: Predictable both-language production & both-language comprehension

experimental: Unpredictable one-language production & both-language comprehension

no intervention: Single language comprehension and production

Interventions

Predictability

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

language context

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

Primary outcome measure

  • Switch costs in different contexts [ Time Frame: An average of one year for each condition ]

Central Contacts and Locations

Locations

UCSD

Recruiting

San Diego, California, United States, 92037

Contacts

Chuchu Li

619-543-5221chl441@health.ucsd.edu

More Information

Sponsor

University of California, San Diego

Last update posted

Nov 12, 2025

Last verified

Sep, 2025

Keywords

  • language control
  • bilingual adults
  • reaction time

Trial information was received from ClinicalTrials.gov and was last updated on 2026-09-10. This information was provided to ClinicalTrials.gov by University of California, San Diego on 2025-11-12.