age, prescription drugs, somatic diagnoses, hx of neurologic insults/injury/trauma, and substance abuse) (These patterns might vary, and can be affected by multiple extrinsic factors, i.e. The system is based on the relationship between the location of an electrode and the underlying area of the brain, specifically the cerebral cortex.ĭuring sleep and wake cycles, the brain produces different, objectively recognized and distinguishable electrical patterns, which can be detected by electrodes on the skin. This method was developed to maintain standardized testing methods ensuring that a subject's study outcomes (clinical or research) could be compiled, reproduced, and effectively analyzed and compared using the scientific method. The 10–20 system or International 10–20 system is an internationally recognized method to describe and apply the location of scalp electrodes in the context of an EEG exam, polysomnograph sleep study, or voluntary lab research. Electrode locations of International 10-20 system for EEG (electroencephalography) recording
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