Recently
researchers have developed a set of
brainwave reading headphones and they don't need batteries to run because they are powered by the
body heat and
sunlight.
The the total
power generated by any of these methods is about
1 mW, which is more than enough to get it to detect
brainwave accurately and send to the receiver.
The headset is actually a
portable electroencephalogram (EEG) device that is made to resemble a set of headphones.
The headset is meant for
seizure patients, remote monitoring them whether they're under certain
stressed conditions. Or it can be used as input devices for
computer games that allow you to control the game play with your mind.
The headset needs about
0.8mW of electricity to detect the
brain wave signal.
Other interesting use could be to
detect brain activity when the person who weares it is sleeping, which could lead to a
better understanding of sleep and improve the quality of sleep.
The headset was developed at the
Interuniversity Microelectronics Centre in
Belgium.
written by Robert M. 
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