fMRI studies have found that the brains of those with dyslexia rely more on the right hemisphere and frontal lobe than the brains of those without it. This means, when they read a word, it takes a longer trip through their brain and can get delayed in the frontal lobe. Because of this neurobiological glitch, they read with more difficulty.
But those with dyslexia can physically change their brain and improve their reading with an intensive, multi-sensory intervention that breaks the language down and teaches the reader to decode based on syllable types and spelling rules. The brains of those with dyslexia begin using the left hemisphere more efficiently while reading, and their reading improves.
Learn more about dyslexia by watching the TED-Ed Lesson What is dyslexia? - Kelli Sandman-Hurley
Animation by Marc Cristoforidis