Assertion: electroencephalograph | /r/HasProperty | apparatus
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text: The electroencephalograph (EEG) is an apparatus which is capable of 'capturing' the brain's electrical activity and displaying an electrographic representation of this electrical activity, in the form of 'brain waves'--which appear as lines running horizontally on a computer screen (formerly, a needle/stylus bouncing up and down on a very long scroll of perforated paper; like a seismometer!).