Muse maker Interaxon and Emotiv trained brain AI. Their privacy policies caught up later.

Muse headband maker Interaxon and Emotiv trained AI brain models on users’ recordings. Their privacy policies spelled out that use only after inquiries. Emotiv’s revised policy describes training subject to opt-in consent. Interaxon says it used about 50,000 hours of brainwave recordings, with names and emails removed.