If the measured distance from nasion to inion is 36 cm, what is the distance from Cz to Pz?

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Multiple Choice

If the measured distance from nasion to inion is 36 cm, what is the distance from Cz to Pz?

Explanation:
In EEG electrode placement, distances along the midline are defined as percentages of the nasion-to-inion distance. Cz sits at about 50% and Pz is further back, around 70% of that distance, so the spacing between Cz and Pz corresponds to about 20% of the total head length. With a nasion-to-inion distance of 36 cm, Cz to Pz is 0.20 × 36 cm = 7.2 cm. This matches the given correct value.

In EEG electrode placement, distances along the midline are defined as percentages of the nasion-to-inion distance. Cz sits at about 50% and Pz is further back, around 70% of that distance, so the spacing between Cz and Pz corresponds to about 20% of the total head length. With a nasion-to-inion distance of 36 cm, Cz to Pz is 0.20 × 36 cm = 7.2 cm. This matches the given correct value.

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