Japanese company Square Enix has developed a computer game that's partially controlled by brainwaves.

On show at the Tokyo Game Show, the game uses a brainwave-sensing headset from NeuroSky, a US company that develops biometric sensors and similar products aimed at the consumer market.

While playing the game, which is a technical demonstration and not a finished product, a special headset monitors the user's state of relaxation or concentration and based on this allow them to perform certain actions in the game, NeuroSky said.

There's no immediate word on if this might make it into a commercial game, but the demonstration to be shown on tomorrow is based on a new game concept being jointly developed by the two companies, NeuroSky said.