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A case for case: handling letter case selection in written spelling.
Katrina E Forbes1, Annalena Venneri
1Department of Psychology, University of Aberdeen, King's College, Aberdeen AB24 2UB, UK.
Neuropsychologia
|November 13, 2002
Summary
This study details a 72-year-old woman's specific writing difficulty, known as peripheral dysgraphia, characterized by inconsistent letter case usage despite correct spelling. This case highlights a potential deficit in inhibitory mechanisms during writing.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Linguistics
Background:
- Investigating the neural and cognitive underpinnings of writing, particularly focusing on specific subtypes of dysgraphia.
- Understanding the dissociation between oral spelling and written output in neurological conditions.
Observation:
- A 72-year-old woman (Pp) exhibited significant case mixing errors in written tasks, despite flawless oral spelling.
- Her impairment persisted across various written tasks, including word and non-word spelling, picture description, and transcription.
- Despite correctly selecting letters and order, Pp struggled with appropriate case selection, suggesting a specific allographic coding deficit.
Findings:
- The patient demonstrated peripheral dysgraphia, characterized by intact orthographic representations but impaired selection of allographic codes for upper and lower case.
- Neuropsychological assessment and MRI indicated mild vascular dementia with attentional deficits, potentially contributing to the writing impairment.
- The findings support a model where an inhibitory mechanism, crucial for maintaining correct case selection, may be compromised.
Implications:
- This case provides insights into the complex processes involved in written language production and case selection.
- It suggests that specific deficits in inhibitory control following case selection can lead to distinct writing impairments.
- Understanding such specific deficits is crucial for accurate diagnosis and targeted interventions in patients with cognitive and neurological disorders affecting writing.