In which area is the Fz electrode site located according to the 10/20 system?

The Fz electrode site is located in the frontal region according to the 10/20 electrode placement system, which is commonly used in EEG and polysomnography to standardize electrode positioning on the scalp. In this system, 'F' denotes the frontal area, and 'z' signifies the midline, thus Fz refers to a location at the midline of the frontal region. This placement is crucial because the frontal lobes are associated with various cognitive functions and can provide important data when monitoring brain activity during sleep. Understanding electrode placements like Fz is fundamental for accurate assessment and interpretation in polysomnography.