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Sinhala Dyslexic Writing Pattern Taxonomy
This document defines the interpretable dyslexic writing-pattern taxonomy used in this project.
The taxonomy is derived from surface-level orthographic and phonetic deviations observed in Sinhala dyslexic writing.
1. Orthographic Instability
Definition:
Inconsistent or incorrect written forms of characters without strong phonetic substitution.
Surface Signals:
- Character omission
- Character addition
- Diacritic loss
- Inconsistent spelling
Example:
- Clean: රුපියල් දෙදාහක් තියෙනවා
- Dyslexic: රුපියල් දෙදාහක් තියනව
2. Phonetic Confusion
Definition:
Errors that reflect confusion between phonologically similar sounds.
Surface Signals:
- Character substitution
- Phonetically similar replacements
Example:
- Clean: ගණිත
- Dyslexic: ගනිත
3. Word Boundary Confusion
Definition:
Difficulty maintaining correct word segmentation.
Surface Signals:
- Word merges
- Extra spaces
- Missing spaces
4. Mixed Dyslexic Pattern
Definition:
Presence of multiple dyslexic patterns within the same sentence or essay.
Criteria:
- More than one dominant surface error type
5. No Dominant Pattern
Definition:
No consistent dyslexic pattern detected or very low error density.
Notes
- Patterns are assigned using rule-based dominance logic.
- This system prioritizes explainability over raw accuracy.