Fact · Accessibility and health
In a 2015 study of Spanish adults, the adults with dyslexia made errors affecting individual letters or letter groups, through substitutions, deletions, additions and transpositions, and word length significantly affected their errors.
Checked against its source on October 17, 2026
In the source's own words
“make errors affecting individual graphemes (substitutions, deletions, additions, transpositions), and they show a significant effect of word length”
Spelling impairments in Spanish dyslexic adults, Olivia Afonso et al., Frontiers in Psychology, 2015, Discussion.
Open the original (DOI 10.3389/fpsyg.2015.00466)- What it measures
- The study compared adults with dyslexia with a control group on written spelling tasks. Errors were classed by the letters or letter groups they affected.
- What it does not show
- The error types come from a Spanish study with a small sample. Errors in English spelling, and in typed versus handwritten text, may follow different patterns.