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which I think is likely the most authentic form of automatic writing
It all comes from the same place. How you begin the chain of associations is irrelevant to "authenticity." Some people seem to prefer to sit and wait, while others prefer to wade right in.
Different styles, same substance. Pretty much the same results, too, probably, after a few lines.
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it could be suggested that this mode may be similar to channeling
That's where you get into "other belief systems" and their different candidates for "who somebody else is" when it feels to the writer that he or she is not controlling the production.
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Auto writing is fake. If you think you will think of something your subconcise will think of it.
As so often around here, we have a phenomenon and its interpretation.
The phenomenon is well established, in the literature since 1823, and Borne didn't claim that he invented it. There is what may be a version of it in Aristotle's
Poetics.
The interpretation turns on who the "someone else" is supposed to be when the writer reports "it feels as if someone else is writing it."
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The only way to prove it is to have info about someone that you dont have access too.
Good plan, but read the Freud-Borne story again. Freud didn't know, and neither does anybody else, all that he knows about other people.