Using our brains: Neuromarketing, no-hands gaming and the arrival of the EEG headset

Using our brains: Neuromarketing, no-hands gaming and the arrival of the EEG headset: "Until recently a purely lab based technology, brainwave (electroencephalograph or EEG) headsets are trickling into the marketplace in a number of different guises. But what exactly do these devices do, how do they differ from each other and - with potential applications ranging from medicine to gaming and market research - who will use them and for what purpose?"