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Assessing Dyslexia at Six Year of Age

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Dyscravia: voicing substitution dysgraphia.

Aviah Gvion¹, Naama Friedmann

¹Tel Aviv University, Tel Aviv 69978, Israel.

Neuropsychologia

|March 20, 2010

Summary

This study introduces dyscravia, a new writing disorder where individuals substitute letters based on voicing, like writing "coat" for "goat". This specific phoneme-to-grapheme conversion deficit can occur selectively in writing.

Area of Science:

Neuroscience
Linguistics
Cognitive Psychology

Background:

Dysgraphia encompasses various writing impairments.
Previous research has not detailed voicing-specific errors in writing.

Observation:

Two Hebrew-speaking individuals with acquired dyscravia and surface dysgraphia were studied.
Voicing errors (e.g., 'coat' for 'goat') were prevalent in their writing to dictation and nonword spelling.
Auditory and repetition tasks ruled out deficits in auditory processing or graphemic/phonological buffers.

Findings:

The core deficit in dyscravia is localized to the phoneme-to-grapheme conversion, specifically within a function processing phoneme voicing.
This voicing conversion function can be impaired selectively in writing, as demonstrated by one participant who showed no reading errors.

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The other participant exhibited voicing errors in nonword reading, suggesting voicing sensitivity in grapheme-to-phoneme conversion as well.

Implications:

Identifies a distinct neural or cognitive function for voicing conversion in the phoneme-to-grapheme pathway.
Highlights the potential for selective impairment of this voicing function in acquired dysgraphia.
Suggests that voicing is a critical feature processed at multiple stages of speech-to-text conversion.