Genius by Stephen Hawking | Clip | Brain Activity and Fireworks

The volunteers gather in front of the castle and one places EEG equipment on his head. His brain signals can be seen projected onto the side of the castle. The EEG specialist explains how they change when a decision is made and how they can complete the Libet Experiment. What do they see when they press the red button and what will it tell them about the brain when they make a decision?