<unk>  <unk>  is the  measurement of electrical activity produced by the brain as recorded from electrodes placed on the scalp.
Just as the activity in a computer can be perceived on multiple different levels, from the activity of individual transistors to the function of applications, so can the electrical activity of the brain be described on relatively small to relatively large scales. At one end are action potentials in a single axon or currents within a single dendrite, and at the other end is the activity measured by the scalp<unk> .
The data measured by the scalp<unk>  are used for clinical and research purposes. A technique similar to the<unk>  is intracranial<unk>  (icEEG), also referred to as subdural<unk>  (sdEEG) and electrocorticography (ECoG). These terms refer to the recording of activity from the surface of the brain (rather than the scalp). Because of the filtering characteristics of the skull and scalp, icEEG activity has a much higher spatial resolution than surface<unk> .
Electroencephalography
Magnetoencephalography
Seizure electroencephalogram
Seizure electrocardiogram
Electrophysiology
Brain mapping
Lumbar puncture
National Institutes of Health Stroke Scale