@igm,
As I understand it questions about
proving the existence of "self" are as fatuous as
proving the existence of "gods". Both clearly have ontological status in the sense of psychological or sociological functionality, and
degrees of functionality may be all that can be said of
existence.
1. "Self" is a concept somewhat like "mind". It has no specific
location . All we can say is that like "mind" an individual human body appears to be
necessary for the operation of "self" but not
sufficient to account for it, since this concept functions in the social semiosphere, reified by language, and sustained by other concepts such as "relationship with others", "will", "obligation" and so on.
2. But in the sense of Buddhist non-duality which is
transcendent of language ( which segments what we call "daily reality" into "things"), clearly
individual "bodies" and "selves" have no ontological status, nor does "thought" in terms of "things". The non-dualistic claim is therefore that "self" is an aspect of
samsara or roughly "everyday cyclical experience in a time dimension", whereas meditational practice can give a glimpse of
nirvana or "holistic non-temporal non-spatial being". It is the re-emergence of "self" back into
samsara which describes the meditational experience as one of "non-self". Note that in the selfless state there is no requirement to communicate ....(there are no others !)... nor is there any "time"in which communication can take place.... nor is there any worded thought with which to communicate.