Hello! This is Andy. I’m about to tell you about something way cooler than implanting a chip in the brain to control robot arms, which is a very hard subject to top.
You can read brain activity by just shooting lasers into your skull and seeing how much of it comes back out. Introducing fNIRS, or functional near-infrared spectroscopy.
The basic principle of fNIRS is that blood changes shade as it becomes more oxygenated. Since deoxygenated blood absorbs more red light than oxygenated, it appears darker.