Category Learning Retention in Adults With and Without Developmental Language Disorder

This study is looking at how adults, both with and without Developmental Language Disorder (DLD), learn and remember new information. DLD affects about 7% of people and can make learning and memory challenging. Researchers want to find the best way to help adults with DLD remember what they learn, especially overnight. You would participate in "Perceptual category training," which involves a computer task where you learn difficult sounds and images. The study aims to enroll 540 adults aged 18-55 who are native American English speakers with typical vision and hearing. Success will be measured by how well you can tell apart different speech sounds after one week and how well you can identify categories after 48 hours. The current recruitment status is unclear.

Study design
This interventional study plans to enroll 540 participants, including adults with and without Developmental Language Disorder. It will involve different training schedules over 24 hours.
What's involved
You would complete a forced-choice categorization task with feedback to learn difficult auditory and visual categories. The training will take place over 24 hours.
Compensation
Not stated in the trial record.
Follow-up
Your speech discrimination will be measured at 1 week, and category identification will be measured at 48 hours.

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NCT05901493

Category Learning Retention in Adults With and Without Developmental Language Disorder

Recruiting
NAAges 18–55InterventionalBasic science
University of Delaware
~540 participants
Updated 2026-05-29 on ClinicalTrials.gov
What's tested:Perceptual category training

At a glance

Recruiting sites
2 of 2 listed sites are recruiting right now
RecruitingSuspended, closed, or not yet open
What they're measuring
Speech discrimination - behavior
Measured over 1 week
+1 more outcome measured
Developmental Language Disorder
Adults Without Language Disorder

NCT05901493

Where you'd take part

This study runs at 2 sites. They're the same protocol — you choose where, and that choice sets who your contact draft is addressed to.

  • Northeastern University

    Boston, Massachusettsstudy coordinator listed

    Recruiting

  • University of Delaware

    Newark, Delawarestudy coordinator listed

    Recruiting

Sites open and close at different times, so the status above is per site — it can differ from the study's overall status.

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Eligibility criteria

Inclusion

native speakers of American English
Grew up in a household in which only American English was spoken
18-55 years of age
Typical vision \& hearing
(Aim 2) access to headphones/devices capable of accessing experiment script via internet
Must meet criteria for Group membership as either TD or DLD

Exclusion

History of neurological disorders
History of psychiatric disorders
History of socio-emotional disorders
On prescription medication(s) that alter sleep
  • Speech discrimination - behavior1 week

    Participants will be administered a short (approximately 4-minute) behavioral task. They will be exposed to two speech sounds, separated by a 1-second interval. Some sounds will begin with the dental stop consonant, and other sounds will begin with the retroflex stop consonant. Participants will be asked to decide if the two sounds they hear are the same or different. Accuracy will be converted to d-prime (a measure of signal detection). This d-prime score will be the primary behavioral outcome for speech discrimination.

  • category identification - behavior48 hours

    Participants will be administered a short (approximately 2 minutes) for each modality (auditory and visual). Participants will either hear (auditory - pure tone) or see (visual - gabor patch) a stimulus, and will need to choose which category the stimulus belongs to out of a choice of two. The percentage of trials that are answered correctly will be the primary behavioral outcome for auditory and visual category identification.