What is the percentage from the Naisson to Fpz distance?

The percentage from the Naisson to Fpz distance is calculated based on the standard 10-20 system used in electroencephalograms (EEGs) and sleep studies. In this system, the placement of electrodes is defined in relation to the total head circumference.

In this context, the distance from the Naisson point (the nasion, which is the bridge of the nose) to the Fpz (frontal pole, in the front of the head) is typically considered a percentage of the total length of the head from the nasion to the inion (the back of the skull). The specific distance represents a smaller portion of this head measurement.

The 10% designation corresponds to the Naisson to Fpz distance when expressed as a proportion of the total distance, which aligns with how electrode placements are systematically determined in neurophysiological practices. Thus, 10% reflects the standard practice and anatomical landmarks utilized in sleep medicine and EEG studies for accurate electrode positioning.