12. July 2026

What Is Working Memory, and Why Does It Matter for Dyslexia?

If your child has had a dyslexia assessment, you may have seen the term working memory in the report. It often comes up as an area of difficulty, and it can be one of the harder concepts to explain to a child or to a teacher. This post unpacks what working memory actually is, why it matters so much for reading and learning, and what can be done to support it.

What working memory is

Working memory is the system the brain uses to hold information in mind while doing something with it. It is sometimes described as a mental workspace. When you follow a set of verbal instructions, keep track of a sum in your head, or remember the beginning of a sentence while you are still reading the end of it, you are using working memory.

It is not the same as long-term memory, which stores things we have learned over time. Working memory is temporary and limited in capacity. Most people can only hold a small number of pieces of information in it at once, and when that limit is reached, things start to drop out.

Why it matters for reading

Reading makes significant demands on working memory. A child has to decode individual words, hold them in mind, process the meaning of the sentence as a whole, and keep track of where they are on the page, all at the same time. For children who decode fluently, much of this becomes automatic over time and the working memory load reduces. For children with dyslexia, decoding remains effortful for longer, which means working memory stays under pressure at the very point when it needs to be free to process meaning.

This is one of the reasons why a child with dyslexia can read individual words correctly but still struggle to understand what a passage is about. By the time they have worked through each word, the earlier parts of the sentence have already dropped out of their mental workspace.

Working memory and the classroom

The classroom makes heavy demands on working memory throughout the day. Copying from the board requires a child to hold text in mind while shifting attention between the board and their page. Following multi-step instructions requires holding several pieces of information at once. Listening and taking notes at the same time splits attention in a way that quickly overloads the system.

Children with poor working memory are sometimes described as inattentive or as not listening. In many cases, they are listening, but the information is not staying in place long enough to act on it. Understanding this distinction matters enormously for how a child is supported in the classroom.

How working memory shows up in an assessment

In a formal dyslexia assessment, working memory is typically measured through tasks that ask a child to hold and manipulate sequences of numbers, letters, or words. A child might be asked to repeat a string of digits in reverse order, or to recall a series of words after a short delay. These tasks give a standardised picture of how much the working memory system can hold and how efficiently it operates.

A low working memory score does not mean a child is less intelligent. It means one specific cognitive system is working differently, and that difference has a knock-on effect on learning that deserves proper support.

What helps

In the classroom, reducing the working memory load makes a significant practical difference. This might mean breaking instructions into smaller steps, providing written prompts alongside verbal ones, allowing extra time for tasks that involve copying or note-taking, and giving a child space to re-read instructions rather than relying on what they can hold in mind.

At home, avoiding long chains of verbal instructions and checking understanding after each step rather than all at once can help considerably. Additionally, reducing background noise and distraction during homework frees up more of the working memory system for the task itself.

Working memory does not work in isolation. When a child is anxious, tired, or under pressure, it performs less well than it does in calm and supportive conditions. This is worth bearing in mind both at home and when discussing support with school.

A final word

Working memory difficulties can be easy to misread as inattention or lack of effort, both at home and in school. Understanding what is actually happening makes an enormous difference to how a child is supported. Get in touch and we can talk through what an assessment might show and what it could mean for your child.

How Defining Dyslexia can help

At Defining Dyslexia, we offer full diagnostic SpLD assessments for children and adults across Sheffield, South Yorkshire, and Peterborough, with remote assessments available across the UK. Every assessment includes time at the end to talk through findings together, so you leave with a clear understanding of the results, not just a document to decipher on your own.

If you have questions about your child's scores, or you are wondering whether an assessment might be the right next step, we are happy to have an initial conversation. There is no obligation, and sometimes a short chat is all it takes to feel clearer about where to go next.

You can get in touch via the contact page at https://www.definingdyslexia.org/contact-us/