My understanding is that the braingate array (and their competitor, the Utah Array) have much finer electrodes than eCoG's which are macroelectrodes, so you can

My understanding is that the braingate array (and their competitor, the Utah Array) have much finer electrodes than eCoG's which are macroelectrodes, so you can get a finer array of local field potential recordings or even single neuron spike recordings. Implanted BCI isn't new, but neither are computers, and both have incredible amounts of room to improve and innovate.