It’s an unusual aesthetic, but it works: Spray-on tattoos that dot the head can collect brain activity without the consternation caused by typical tests. The electronic tattoos, described December 2 in Cell Biomaterials, go on with a microjet printer, last for hours and wipe off with soapy water.
Electroencephalography, or EEG, is a common medical test that can help diagnose epilepsy, brain injuries and sleep disorders. The test relies on electrodes glued to the scalp, where they pick up signals generated within the brain. But pitfalls abound: Hair can stymie electrode contact, wet gels can dry out and wires and caps can form a Medusa-esque snarl, making it hard
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