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

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Prepare for the AASM Sleep Technologist Test. Enhance your knowledge with flashcards and multiple-choice questions, each offering hints and detailed explanations. Get confident for your exam!

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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