<P> Electroencephalography ( EEG ) is an electrophysiological monitoring method to record electrical activity of the brain . It is typically noninvasive , with the electrodes placed along the scalp , although invasive electrodes are sometimes used such as in electrocorticography . EEG measures voltage fluctuations resulting from ionic current within the neurons of the brain . In clinical contexts , EEG refers to the recording of the brain 's spontaneous electrical activity over a period of time , as recorded from multiple electrodes placed on the scalp . Diagnostic applications generally focus either on event - related potentials or on the spectral content of EEG . The former investigates potential fluctuations time locked to an event like stimulus onset or button press . The latter analyses the type of neural oscillations ( popularly called `` brain waves '' ) that can be observed in EEG signals in the frequency domain . </P>
<P> Electroencephalography ( EEG ) is an electrophysiological monitoring method to record electrical activity of the brain . It is typically noninvasive , with the electrodes placed along the scalp , although invasive electrodes are sometimes used such as in electrocorticography . EEG measures voltage fluctuations resulting from ionic current within the neurons of the brain . In clinical contexts , EEG refers to the recording of the brain 's spontaneous electrical activity over a period of time , as recorded from multiple electrodes placed on the scalp . Diagnostic applications generally focus either on event - related potentials or on the spectral content of EEG . The former investigates potential fluctuations time locked to an event like stimulus onset or button press . The latter analyses the type of neural oscillations ( popularly called `` brain waves '' ) that can be observed in EEG signals in the frequency domain . </P>
which technique measures the electrical activity of brain cells directly
which technique measures the electrical activity of brain cells directly
Electroencephalography ( EEG )
Electroencephalography ( EEG )