Cleveland Family Study
17.8.3.7 To Determine O1 and O2
- Locate the inion.
- Measure up the head 10%. This is Oz or the central O.
- Mark this spot with a china marker. Measure to the left 10% for O1. Measure out to the right for O2. Visually, these channels should be symmetrical on the patient’s head behind the eyes.
Note: O1 and O2 are only used for the Sleep Vigilance concentration test. The channels are not recorded with the sleep studies.