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"This self talk is the basis of Default Mode Network"

That idea interest me. Can you elaborate it? Maybe some link? Thanks.

Please look up Judson Brewer and Gary Weber (sorry for brevity, I'm on the go).

EDIT: actually this is an excellent resource for the HN crowd, 100% BS free. It explains DMN and much more: https://www.coursera.org/learn/science-of-meditation