This could just mean that the brain can no longer access the spirit mind, if the brain is damaged in certain ways. As I have said memory cannot just be electrically stored in brain cells, because electric shock treatment would permenantly wipe it. ECT is over one hundred volts, and it is passed through the brain which operates at less than half a volt, so no memory could survive unless there is another mechanism of storage other than electrical.
It could also mean that the brain can no longer access fairies, but then that would beg the question of "do fairies exist ?" just as yours begs the question of "does the soul exist ?" Furthermore, if the brain can "access" the mind, that means there's an interaction between the two. No such interaction is in evidence, therefore your suggestion is nothing but sheer speculation. Until you can show evidence for that suggestion, I'll go with the explanation that works. You asked, I answered.
My point is that regardless of how, we know it's stored in there.
Brains are the thing to focus on in regard to how data is stored in regard to chemistry, which is a fundamental aspect of biological [life] forms.
Living structures able to store memory.
The memory of course is data. It is secondary to the point that memory can be stored, whatever the device. It is not so much what stores it as to what creates it and retrieves it.
Biology breaks down. As a storage device it has its limitations and if the pathways are damaged other pathways have to be built but eventually the gig is up and no retrieving can be done.
Now in terms of an individuate consciousness which experiences life from the perspective of being within human form, what it experiences creates the data which is stored in the brain it has the use of, and it [the individuate consciousness]alone is the only thing which can retrieve said data for itself/use.
The importance of this fact is worth the effort repeating.
In a physical universe it most obviously appears that devices are necessary for data storage, but this observation alone does
not compel one conclude that other devices are not attached to that data or to the processes of individuate consciousness (your processes as an individual) that the data of your/my/our experience(s) is/are not able to be stored elsewhere or retrieved as is necessary.
The concept of 'the soul' has this attached to it.
If you trace back to the origin of the idea of the soul you will discover a time when being aware of the connection with that larger aspect of your total self was common place. It is now largely unknown but that does not signify it is a dead thing.
Furthermore the idea of the soul is not that
you have one, but that the one has you.
You are its data gatherer.
Now call it what one will, it is able to be connected with and communicated with and through a variety of engaging processes, understood for what it is by its own explanation (as to what it is) independent of what you might otherwise think, have thought, or even that you resist thinking, or have never thought along such lines in relation to the idea of this thing sometimes called 'soul'.
All that is required is in order for it to communicate to you what it is, is your attentive focus and ability to at least meet it halfway in relation to the physical and how data is transferred.