What if:

The left and right brain theory is no longer 100% valid, but it makes my question a bit less complicated.

What if the left (mathematical, and ordered) part of the brain switches off.
The things you used to know are no longer available when you need them.
You know that you know something but you cant remember any of it.
Math formulas are at the tip of the tongue, but nowhere to be found. Simple things that where once very ordered in the mind are just not there anymore. but years later you still know that you know those things.

When someone asks a question then the mind goed Ooooh thats simple, just use...
erhm... there was this formula... what was it again.... and you just can't get there anymore.
Yet the creative part of the brain manages to fill the void. With all kind of weird side effects. And people just have a hard time to figure out what you are doing.

Specially leftbrainers tend to be a problem sometimes, when they start to do 'cliche thinking' and put you in a corner without even questioning themselves. That aside, but this shows the social problem / side effects that you have to deal with when the so called 'left brain' has taken off and is nowhere to be found, not all of it, but a very significant part is just not available anymore.

Are there ways to get access to that area again?

I often wonder if the knowledge is really lost, or if it still exists.
As you know that you know the answer, but you can't access the answer. Is the answer really 'damaged' or lost... Or can it still be in tact, but just needs a new neural path TO that area of the brain?

:-D yes i have many more questions like this