Developmental graphemic buffer dysgraphia in English: A single case study.

Area of Science:

• Cognitive Neuropsychology
• Developmental Psychology
• Linguistics

Background:

• Investigating developmental cognitive disorders requires appropriate theoretical frameworks.
• Adult cognitive models are often used, but their applicability to childhood conditions needs validation.

Observation:

• A 10-year-old boy exhibited spelling errors characteristic of acquired graphemic buffer dysgraphia (GBD).
• Errors included deletions, additions, substitutions, and transpositions across written, typed, and oral spelling tasks.
• Spelling performance was influenced by word length and serial position, consistent with graphemic buffer models.

Findings:

• The case supports the application of adult cognitive models, specifically the dual-route model of spelling, to developmental disorders.
• The primary deficit was localized to the graphemic buffer, a key component in spelling production.
• Lexical variables also impacted spelling accuracy, indicating complex interactions within the spelling system.

Implications:

• This study validates the use of cognitive neuropsychological approaches for diagnosing developmental learning disabilities.
• Early and systematic investigation is crucial for accurately identifying and understanding specific learning difficulties like graphemic buffer dysgraphia.
• Findings contribute to refining our understanding of the developmental trajectory of spelling and its underlying cognitive mechanisms.