I would definitely suggest not using epilepsy patients as lab rats. First off, the article says "Machine learning is inherently notoriously inscrutable" which is extremely wrong and ignorant. Then they proceed to demonstrate how they essentially failed to force people to memorize useless words on a screen, by zapping their brains while not really know what they're doing or how anything works. This is NOT my idea of ethical, late-stage pre-market human research. This is something to do on rats, not people. This is the same as shock therapy of rebellious women in the 60's. It's horrible, has irreversible side effects and you need to stop doing it. These are people, not toys for PhDs.