Quiz 06: Electrodes and the 10–20 system

6 questions on lesson 6. Nothing is timed. Pick one answer for each, then check them.

1. Why is it called the 10–20 system? Electrodes sit at 10 % and 20 % steps of head measurements It records from 10 to 20 Hz Electrodes are 10 to 20 mm apart It uses between 10 and 20 electrodes

2. On which side of the head is an electrode with an odd number, such as C3? On the midline Left Right At the back

3. What does the letter C in Cz, C3 and C4 stand for? Cranial Central Cerebellum Cortex

4. What is the newer name for electrode T3? P7 T5 F7 T7

5. Along the line from the nose (nasion) to the back of the head (inion), where is Cz? At 10 %, just above the nose At 30 % At 50 %, the top of the head At 90 %, just above the back of the head

6. Where are A1 and A2, and what are they often used for? On top of the head, as the main recording site On the neck, to record the heartbeat On the forehead, to record eye movements On the ear lobes, often as the reference

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