

Just so it’s clear, each subject spent hours training their own AI to recognize words they intentionally produced as “inner voice”. At the end, each trained AI could only recognize those trained words, and only from their trainer.
That’s quite a bit different than an AI that could recognize new words in a completely different person. I think that’s as unlikely as training ChatGPT using only English texts and then expecting it to understand Chinese.
Normally words are all trained together, not one after another. Subjects do a monitored task that includes the entire vocabulary list, data from that task is processed extensively off-line, and finally subjects return to test all the vocabulary words.