In experiments, Fagiolini and her team placed this transparent microarray on the visual cortex of live, awake mice. This allows light to pass through the electrode array so that the brain can be imaged at the same time. Second, the team applied nanotechnologies to make the electrodes transparent. This enables researchers to collect very fine-grained information, down to the level of single neurons. First, the electrodes are placed very close together on the surface of the cortex - a few micrometers apart, as opposed to millimeters currently. The new EEG microarray, described today in Science Advances, combines two key advantages. It promises to be much more useful for understanding the brain’s workings. Nor is it possible to easily compare EEG data with brain imaging data.Ī collaboration between neuroscientist Michela Fagiolini, PhD at Boston Children’s Hospital and engineer Hui Fang, PhD at Northeastern University has led to a highly miniaturized, see-through EEG device. But current EEG electrode arrays, even placed directly on the brain, cannot distinguish the activity of different types of brain cells, instead averaging signals from a general area. Electroencephalography (EEG), which records electrical discharges in the brain, is a well-established technique for measuring brain activity.
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