There seems little doubt that the advent of brainwave reading technologies heralds a new age in human-computer interaction. The first commercially available devices are likely to be used to for gaming, but the potential uses for this technology are bound to elicit excitement and worry in equal measure. Researchers have developed systems that read brainwaves – in the form of electroencephalogram (EEG) signals – in order to help people suffering from disabilities or paralysis control wheelchairs, play games, or type on a computer. Now, two companies are preparing to market similar devices to mainstream consumers. In the coming months, cheap . . . . . .