It means that users of Glass no longer have to touch the specs or use a voice command to take a picture, which will thrill some photographers but cause other people to worry that the innovation could be used to invade their privacy by wearers taking covert photos.

Built by London-based firm This Place, the free app, which launches today, uses Google Glass and the Neurosky EEG biosensor.

The app enables the sensor, which measures brainwaves to translate brain activity into action, to communicate with Google Glass, allowing users to control actions on the device by concentrating and relaxing.

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