Does the physical world alter of affect underlying consciousness?

[Andrew]

Sorry if this has been discussed before but as someone with a loved one who died with advanced dementia I was curious how Kastrup or others think/theorize about how consciousness for an individual *seems* to change or distinguish itself based on so-called physical world changes.... some examples:

• as a baby your inner life tends to be different from when you are an adult
• if you are a healthy adult, your consciousness tends to be different than if you develop a dementia later in life or suffer some kind of brain damage

Are these just examples of changes in the "filter" that we experience in the physical world, but the experience in the conscious world might be continuous? It strikes me, that if for example NDE experiences have some ring of an experience of "pure" possibly expanded consciousness but yet these reports seem demonstrate a continuity with the physical world? 

As I read reports of NDEs for example I see that typically an adult American English-speaking man has a NDE and during that NDE he seems to have the same consciousness though it may be expanded, with memory of his previous state in physical world and during the experience he is experiencing this phenomenon in English. I don't see a lot of NDE reports of such a person all of a sudden understanding Chinese or knowing about the house they lived at in a previous life in another country, etc. I don't see reports of NDEs knowing the future/other universes (if time + our physical world is an illusion) or having continuity with a species of conscious being on another planet (though I know there are sometimes reports of "other" beings).  It sort of makes me think there's this eternal consciousness that is at least temporarily influenced or limited by the physical world it inhabits for some "time". 

What might this kind of NDE experience be like for someone with advanced dementia? Would their mental faculties return to some state of more clarity? The dementia acts as a kind of distortion of the consciousness filter? The NDE experience is mostly void of language and its more "feelings" of understanding? Would a baby, who may still see the physical world in a baby's terms, somehow experience an NDE with more like an adult understanding? What is the theory of the underlying consciousness and why/how in these examples the "physical world" seems to influence or limit the consciousness?

[RHC]

Google terminal lucidity.

[J Finch]

Adrian Owen has a book (Into the Grey Zone) that may provide some insight