Scientists in Nottingham have invented a new type of brain scanner that can be worn on the head, allowing patients to move while being scanned. The device records the tiny magnetic fields generated by the brain. The researchers said it could revolutionise brain imaging. Writing in Nature, they showed it could pinpoint the part of the brain responsible for activities like nodding, drinking tea and playing bat and ball. Magnetoencephalography (MEG) has been around for decades, but conventional scanners are large, weighing half a ton.