Written expression of students with and without learning disabilities: differences across the grades

Area of Science:

• Educational Psychology
• Developmental Psychology
• Linguistics

Background:

• Learning disabilities (LD) significantly impact academic performance.
• Written expression is a critical area of academic achievement.
• Understanding specific deficits in students with LD is crucial for targeted interventions.

Purpose of the Study:

• To compare the written expression skills of students with learning disabilities (LD) and normally achieving (NA) students.
• To identify specific areas of written expression where students with LD differ from their NA peers.
• To examine these differences across elementary, middle, and high school grades.

Main Methods:

• Writing samples were collected from 48 students with LD and 48 NA students across Grades 4, 8, and 11.
• Samples were analyzed for productivity (word count, sentence count), syntactic maturity (words per sentence, T-units, morphemes per T-unit), vocabulary (word length), and mechanics (capitalization, spelling, fragments).
• A standard stimulus was used to elicit writing samples for all participants.

Main Results:

• Students with LD produced fewer words and sentences than NA students.
• Students with LD wrote more words per sentence, but produced fewer longer words (7+ letters) and sentence fragments.
• Higher percentages of capitalization and spelling errors were observed in students with LD; no differences were found in T-units or morphemes per T-unit.

Conclusions:

• Students with learning disabilities demonstrate persistent deficits in written expression across multiple grade levels.
• Specific challenges include lower productivity and greater mechanical errors, despite comparable syntactic complexity in some measures.
• Findings underscore the necessity of reviewing and enhancing current educational practices to better support students with LD in writing development.