Quiz 01: What EEG is, and what it isn't

8 questions on lesson 1. Nothing is timed. Pick one answer for each, then check them.

1. What does EEG record? The brain's electrical activity, from the scalp Changes in blood oxygen in the brain A picture of the brain's structure The brain's magnetic fields

2. About how big is the voltage one scalp electrode measures? A few nanovolts A few volts A few millivolts A few tens of microvolts

3. What is EEG good at, and what is it weak at? Good at showing the brain's structure, weak at timing Good at timing, weak at showing exactly where activity comes from Good at showing where activity comes from, weak at timing Good at both timing and place

4. In the data engineering view of an EEG recording, what is one channel? One file per electrode One row of the table One label, such as "eyes closed" One column: the voltage of one electrode against a reference point

5. A recording takes 500 samples a second. How often does it take a reading? Every 500 ms Every 2 ms Every 5 ms Every 0.5 ms

6. Which tool would you use to see the shape of a brain tumour? MEG EEG MRI or CT None of these tools can show it

7. A routine EEG looks normal. What does that mean for epilepsy? Epilepsy is confirmed The person needs an fMRI scan instead It does not rule out epilepsy Epilepsy is ruled out

8. 64 channels are recorded at 1,000 samples a second for 1 hour. How many values is that? 3.84 million 23.04 million 230.4 million 2.304 billion

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