There's a big literature on treating neurological and psychiatric conditions by stimulating the brain electrically or magnetically through the skull (ie without surgery). There are cheap home devices for tDCS (direct current) but there's better evidence for rTMS (magnetic) ...
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and the rTMS machines are still quite expensive (8K on Ebay). Fortunately there's instructions on how to make your own!https://www.instructables.com/id/Transcranial-Magnetic-Stimulation-TMS-Device/ …
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The big effect sizes (5 percent IQ improvements, total recovery of ability to read nonverbal communication for some autistics) are all rTMS, not tDCS; metastudies show that tDCS doesn't actually improve cognition
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Replying to @s_r_constantin
Pessimism: This could just be what it looks like to compare two things that are at different stages of the replication-crisis lifecycle.
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true; could go both ways though; it could be that both work when done "right", are copied by new entrants who do it "wrong", and then are disconfirmed by skeptics
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