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I have heard the word "tulpa" before, but always described as an imaginary friend that one convinces oneself is real. I have heard of something similar, where someone who has amnesia will sometimes display a distinctly different personality than their pre-amnesiac persona, or even people who have suffered some sort of mental or physical trauma and for some reason they then begin to speak in a different accent.

I know it's unethical to experiment on the human mind (and I would not advocate such a thing), but I do wonder if subjecting ourselves to certain stresses with the intent of adapting the mind in desired ways might be possible.