Electrocorticography

Electrocorticography (ECoG) is the practice of using an electrodeplaced directly on the brainto record electricalactivity directly from the cerebral cortex. By placing the electrode directly onto the cortical grey matterone can record signalsfrom neuronsmuch more effectively than through electroencephalography(EEG). One of the main limitations of EEG is the poor spatial resolution, because the skullacts as an attenuatorof neural signal, thus filteringout high frequencysignals and lowering the signal-to-noise ratio. The biggest drawback to ECoG is the requirement of surgeryin order to place the electrodes under the dura materdirectly onto the brain's surface.

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It uses material from the http://en.wikipedia.org/wiki/Electrocorticography Wikipedia article Electrocorticography.