If the head circumference is 56 cm, what is the distance from Oz to O1?

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Multiple Choice

If the head circumference is 56 cm, what is the distance from Oz to O1?

Explanation:
In the 10-20 EEG electrode system, positions around the head are spaced as fixed percentages of head circumference. Distances from a midline site to a lateral partner are half of the spacing between adjacent lateral sites. So from the midline Oz to the lateral O1, the separation is 5% of head circumference. With a head circumference of 56 cm, 5% is 0.05 × 56 = 2.8 cm.

In the 10-20 EEG electrode system, positions around the head are spaced as fixed percentages of head circumference. Distances from a midline site to a lateral partner are half of the spacing between adjacent lateral sites. So from the midline Oz to the lateral O1, the separation is 5% of head circumference. With a head circumference of 56 cm, 5% is 0.05 × 56 = 2.8 cm.

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