 great big noisy brain scanners like a big sort of donut that you lie in while your brain is scanned but these devices you can buy online are very different what kinds of things can you buy these are quite new aren't they yeah so it's a few different brain-based technologies that are starting to move into the consumer market and the ones we like to play with they shine infrared light through the brain it's called functional near infrared spectroscopy and this near infrared light goes straight through things like bone but can measure the amount of oxygen in your blood