Proportion Ratio
Definition
The height-to-width or stem-to-body relationship within individual letters; encoded in long-term spatial memory and largely preserved under disguise, opposite-hand writing, and block-capital writing.
- What it measures
- Height-to-width and stem-to-body relationship in letterforms
- Encoding
- Long-term spatial motor memory
- Stability
- Largely preserved under disguise or opposite-hand writing
- Discipline
- Forensic questioned document examination
Common questions
Why does proportion ratio survive attempts to disguise handwriting?+
Disguise typically targets features the writer can consciously control, such as slant or letter shape, but the underlying spatial proportions are set at a deeper motor-programming level and tend to leak through even when a writer deliberately alters style.
How is proportion ratio used alongside other handwriting features?+
Examiners rarely rely on proportion ratio alone; it is compared as one of a cluster of features including pen pressure, letter formation, and connecting strokes, and a conclusion of common authorship depends on consistency across the whole cluster, not a single ratio.
Related terms
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- Disguised Writing
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- ESDA Examination
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- Forensic Linguistics
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- Natural Variation vs Disguise Variation
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- Slant Drift
- The progressive reversion of disguised writing slant toward the writer's habitual slant as the document lengthens and cognitive load increases.