| # 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. | |