To get their brain working with the game the player first
focusses on two chequered boxes which flash at different speeds or
frequencies.
By looking at the boxes in turn a frog-like virtual character in
the game, called Mawg, balances and walks across a tight-rope.
If he starts falling to the left, the player has to concentrate
on the box on the right.
The game is not for sale, but it is a way for the researchers to
learn how to develop the technology.
But the researchers say gamers could be attaching headsets to
their own heads in a few years' time.
Sci-fi vision
The research has some serious uses too.
Scientists want to help people who can't move, but who can still
hear, see and think perfectly well.
They might be paralysed or have serious illnesses which stop them
using computers or even talking.
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