Researchers at Tufts University are conducting research to enhance user interfaces depending on blood flow in your brain.  Essentially using the blood flow as a marker for how high your current stress level is and hopefully more targeted information.

This would then be used to modify the user interface you work with to improve it conditionally to your behavior.

The technology is called Functional Near-Infrared Spectroscopy (fNIRS).  Basically it involves taking a headband full of infrared lasers, putting it on your head and shooting your brain with said lasers...ummm, sounds worse than it is.

The fNIRS device, which looks like a futuristic headband, uses laser diodes to send near-infrared light through the forehead at a relatively shallow depth—only two to three centimeters—to interact with the brain’s frontal lobe. Light usually passes through the body’s tissues, except when it encounters oxygenated or deoxygenated hemoglobin in the blood. Light waves are absorbed by the active, blood-filled areas of the brain and any remaining light is diffusely reflected to the fNIRS detectors.

[linky]

This is an interesting angle of research.  Not looking directly at the brain activity but at the blood supply.