Glossary · Reading science and reading difficulty
What is a phonological deficit?
Definition
A phonological deficit is a weakness in processing speech sounds, such as hearing, holding and manipulating phonemes, and it is the difficulty most often linked to dyslexia.
The phonological deficit theory is the leading account of dyslexia. It holds that the core problem is not in vision or intelligence but in the sound system of language. Students struggle to separate words into sounds, so linking letters to sounds is hard and slow.
It shows up in tasks like segmenting, blending, phoneme deletion and repeating nonsense words. It also shows up in spelling that misses sounds or gets them in the wrong order.
A phonological weakness is not a dead end. Students with it learn to read with explicit, systematic phonemic awareness and phonics teaching, though usually more slowly and with more practice than their peers. Starting early makes the biggest difference.
In a lesson
A student can say the alphabet and name every letter but can't tell you the middle sound in fan, and can't say slip without /l/. Those are phonological tasks, not letter tasks.
Why does this matter for the record?
Record phonemic awareness results with dates. A clear history of these checks is useful to anyone evaluating the student later.
Rate each skill as you teach it
Needs support, Developing, Secure. The rating schedules the review and builds the report.