I think the way that it is explained in the video is a bit crude - it gives the impression that the right hemisphere has 'taken over' language processing and that the cause of dyslexia is that information must travel further to reach the language processing part of the brain from the right to left hemispheres. I'm not sure it works like this, but rather that the brain is attempting to compensate for the lack of phonological understanding (located in the left hemisphere) by using spatial cues from the right hemisphere, which would take longer to comprehend as language requires a phonological understanding. With this explanation, it doesn't really matter about the L/R theory as you just have to think about the brain attempting to use a different system, regardless of which hemisphere it's located in.

in response to kim blumberg Show comment

I think, since the video pointed out it usually gets rerouted through the right side and front side which is more on the visual and social side of things, it's just that they might be recognizing things as words, but just which ever word "looks" right. The brain already takes shortcuts identifying words based on the length and beginning/ending letters, so it could be just misidentifying the words or simply not recognizing the word right off the bat. Which is probably why the structured intervention would help so much, because it teaches the logic behind spellings and grammar and contexts, so then it helps involve the rest to make it apparent what the word actually should be. It would help connect both rules, social context, appearance, and sound of the word, which would round out all the facets of words.

While people aren't "Left-brained" or "right-brained", each side of the brain does specialize in a certain type of thing, just because that's where the things are located. However they aren't used all that more often, so you can't really be L/R brain "dominate".
It's just that it gets rerouted into different sections of the brain that normal, which makes decrypting or taking apart words harder than normal.

I think some of the problem comes with the initial definition of the problems and symptoms associated with dyslexia. I believe that it can be broken down into 2 sections which have different causes: difficulty in actually seeing the words - often called Irlen Syndrome; and difficulty in decoding the actual words themselves (lots of different types here, eg phonetic difficulties, swapping in/out or missing of function words). There has been research to show that "dyslexics" improve their reading accuracy if utilising blue filters, alongside research which shows that the magnocellular pathways in dyslexics (part of the visual system to do with contrast) are about 80% the size of non-dyslexics. The action of magno-cellular layer is additionally reduced by the action of long-wave red light (hence blue filters help). The reason this biological difference causes dyslexia is open to at least two different theories. However this difference does not explain the difficulty in decoding words