BCI’s may have started with an EEG to read brain activity but technology has advanced to where BCIs are know being physically embedding into the grey matter of a person brain. These two types of BCI are called Non Invasive( EGG skull cap) & Invasive (Implanting devices into the brain.) Invasive BCI picks up more neuro- activity which provides for a stronger reading as the Non invasive, neutrons can escape detection causing scientist to interpret their meaning.
simonbillyblue 