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Follow the measurement chart using the correct percentages. Where M1 and M2 reference electrodes are placed.

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Follow percentages on chart. Inion — Bony ridge at the base of the back of the skull. F3 and F4 placement F3 Measure from F7 to Fz and divide this number in half, marking that point then Measure from Fp1 to C3 and divide in half, mark that point The point where these two cross is your F3 mark F4 Measure from Fz to F8, divide in half and mark then Measure from C4 to Fp2, divide in half and mark The point where these two cross is your F4 mark.

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Pre-auricular to Pre-auricular Follow the same procedure as above making sure your tape measurer passes over the Cz point. Note the total measurement in centimeters then hook up your T7, C3, Cz, C4, and T8 points according to the percentages specified on the chart. Nasion — The bridge of the nose or lowest indentation point between nose and forehead. Pre-auricular points — Indentations just above the cartilage that covers the external ear openings.

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Pre-auricular points — Indentations just above the cartilage that covers the external ear openings 4. F3 and F4 placement F3 Measure from F7 to Fz and divide this number in half, marking that point then Measure from Fp1 to C3 and divide in half, mark that point The point where these two cross is your F3 mark F4 Measure from Fz to F8, divide in half and mark then Measure from C4 to Fp2, divide in half and mark The point where these two cross is your F4 mark Videos on measuring Measuring starts at 3: Head Circumference Measure around the circumference of the head from Fpz with tape measurer passing over Oz, T7, and T8.

Exploring electrode hooks up commonly used in PSG include: Mastoid Process — bony area located just behind the ear. Measure from Nasion to Inion.

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Nasion — The bridge of the nose or lowest indentation point between nose and forehead 2. Example 40 cm total. Have patient tilt head up and down to feel it better.