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Brain-computer interface easily slips in and out of ear canal
(medicalxpress.com)
This is a most excellent place for technology news and articles.
So, this thing is only entering the external ear canal. Its not getting to the brain. Not only is the eardrum an airtight barrier that only works if its air tight, even if you made it past it theres a lot of organs and bone structure, it doesnt continue as a tunnel into the brain.