Write a brief note on EEG?

Write a brief note on EEG?
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By placing electrodes on the scalp it is possible to record the summed electrical activity of the cortex, in a technique known aselectroencephalography (FEG). EEG measures mass changes in population synaptic activity from the cerebral cortex, but can only detect changes over large areas of the brain, with very little sensitivity for sub-cortical activity. EFG recordings can detect events lasting only a few thousandths of a second. EEG recordings have good temporal resolution, but poor spatial resolution.
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EEG?

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