Measurement of electrical activity in the brain
Electroencephalography is the neurophysiological measurement of electrical activity in the brain as recorded by electrodes placed on the scalp or, in special cases, subdurally or in the cerebral cortex. The resulting traces are known as an electroencephalogram (EEG).
In addition to internal artifacts such as those produced by blinking, there are many artifacts which originate from outside the patient. Movement by the patient generates huge artifacts. Sweating or changes in temperature may cause electrode drifts. Spikes can originate from a momentary change in impedance at a given electrode. Poor grounding of the EEG electrodes can cause significant 50 or 60 Hz artifacts arising from the power system‘s frequency. New and challenging artifacts have emerged as the EEG is increasingly recorded in hostile environments such as the MR Scanner and in association with Transcranial Magnetic Stimulation (TMS).
Brain Products EEG amplifiers are equipped with a number of noise reduction techniques such as active noise cancellation and active electrodes. Brain Products leads the field in the development of amplifiers and electrode caps dedicated to recording high quality EEG data in the MR scanner. High common mode rejection as well as low amplifier noise ensure maximum data quality. Our huge product range includes a range of electrodes and caps with custom or standard montages as well as a variety of requisite accessories.
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