Controllers have limited capabilities, especially for people with disabilities. Exploring alternative input methods gives more options for how to interact with various experiences.

 

The Brain Control Interface (BCI) Brainwaves EEG experience uses a homemade Electroencephalograph as a game controller, so the player can interact with the game completely hands free (in a limited fashion)

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This is just a test to prove that basic functions can work.  In our testing we deliberately ask users to concentrate on simple commands, particularly degrees of mental tension.  As their mental state changes, the environment reacts appropriately.