Category Learning Retention in Adults With and Without Developmental Language Disorder

Approximately 7% of the population experiences developmental language disorder (DLD), a language disorder with unclear causes. DLD affects communication beyond adolescence and poses challenges for education and career advancement due to difficulties in learning and memory. Recent research suggests that adults with DLD struggle with overnight memory consolidation, indicating a need for effective learning and memory support. This project aims to determine the optimal training schedule for perceptual memory retention in adults with and without DLD. The study involves recruiting 240 adults (120 with DLD, 120 without) for speech-perceptual training with different training schedules. The researchers predict that the manipulation of training schedules will interact with circadian preference and overnight consolidation, leading to the discovery of the best practice schedule for speech sound retention. Additionally, 300 more adults (150 with DLD, 150 without) will be recruited to investigate how optimal training schedules interact with reflexive and reflective learning strategies. The time course of learning and retention will be tracked during reflexive and reflective categorization training in six different training schedules.

NCT Number	NCT05901493
Lead Sponsor	University of Delaware Collaborators: Northeastern University
Conditions	Developmental Language Disorder, Adults Without Language Disorder
Enrollment	540 participants
Start Date	2022-10-23
Primary Completion	2026-12-31 (estimated)
Study Completion	2027-07-31 (estimated)
Updated on ClinicalTrials.gov	2026-05-29