89c63891fa
Replace all instances of the legacy product names "Kon" and "Corbie" with "Magnotia" across user-facing copy, code identifiers, package names, bundle ids, file paths, and documentation. Preserves the unrelated "konsole" (KDE terminal) reference and the parent CORBEL company name. - Renames 10 Rust crates (kon-* → magnotia-*) and the tauri binary - Updates package.json, tauri.conf.json (productName + identifier) - Renames CSS classes (kon-rh-* → magnotia-rh-*) and animations - Renames brand and roadmap docs - Regenerates Cargo.lock and package-lock.json Verified: svelte-check passes; pure-rust crates compile under new names.
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A3. Cognitive Ergonomics — Visual Crowding and Typography
Core finding: Spacing is the active ingredient in typographic accessibility — not specialised letterforms. OpenDyslexic does not outperform standard sans-serif fonts. Individual variation is enormous; personalisation matters more than any single font choice.
Spacing evidence:
- Zorzi et al. 2012 (Proceedings of the National Academy of Sciences): 74 Italian and 20 French dyslexic children. Extra-large letter spacing (increased ~2.5pt) doubled reading accuracy and increased reading speed by over 20% in dyslexic children, with no effect on controls. Mechanism: reduced visual crowding.
- Galliussi et al. 2020 (Annals of Dyslexia): Critical nuance — increasing letter spacing without proportionally increasing word spacing actually DECREASES reading speed because word boundaries become ambiguous. Letter and word spacing must be coordinated.
- Joo et al. 2018 (Cortex): Measured individual visual crowding profiles. Only a subgroup with elevated crowding benefited from increased spacing — others did not. This confirms personalisation is essential.
Font evidence (against specialised "dyslexia fonts"):
- Rello & Baeza-Yates 2016 (ACM TACCESS): Most comprehensive eye-tracking study — 97 participants (48 with dyslexia), 12 fonts. OpenDyslexic did not outperform standard sans-serif fonts like Arial, Helvetica, or Verdana. Sans-serif, monospaced, and roman (upright) fonts significantly outperformed serif, proportional, and italic alternatives. Italic text significantly impaired reading.
- Kuster et al. 2018 (Annals of Dyslexia): 170 children with dyslexia read no faster or more accurately in Dyslexie font than in Arial. Majority preferred Arial.
- Wery & Diliberto 2017 (Annals of Dyslexia): Confirmed no improvement with OpenDyslexic across multiple reading tasks.
- Wallace et al. 2022 (ACM Transactions on CHI): 16 fonts across hundreds of participants. Potential speed gains of up to 35% when comparing an individual's fastest vs. slowest font. No single font optimal for everyone. Font preference did not predict reading speed.
ADHD-specific:
- Stern & Shalev 2013 (Research in Developmental Disabilities): ADHD adolescents showed differential benefits from spacing and screen presentation. All participants performed better on computer than paper.
- Cooreman & Beier 2024 (SSSR Conference): Larger x-height fractions increase processing speed at the perceptual level — particularly relevant for ADHD users with reduced processing speed.
Colour contrast:
- Rello 2012 (W3C Symposium): People with dyslexia read fastest with lower-contrast warm pairs like black on crème — not black on white. Only 13.64% of dyslexic readers preferred black-on-white vs. 32.67% of controls.
Implication for Magnotia: Default to a clean sans-serif with large x-height (Atkinson Hyperlegible or Lexend) with coordinated letter, word, and line spacing controls. Offer warm off-white background options (crème, not white). Never use italic for extended reading. OpenDyslexic should be available as an option but not recommended — spacing is the intervention, not letterform. Most importantly: allow full typographic personalisation, because no single configuration is optimal for all neurodivergent users.