Barack and Michelle Obama did not adopt either of their two daughters. Perhaps you are thinking of Mr. Obama's 2008 opponent, John McCain-- he and his wife Cindy did adopt a lâ¦ittle girl from Bangladesh.
The test itself will take about 30-60 minutes. Placing the electrodes usually takes 20 minutes, but can take up to an hour, so the entire procedure may take about one to 2 hours. If you have an ambulatory EEG, brain activity is recorded for 24 hours or more.
EEG allows you to record brain processes that occur shortly after the onset of visual or auditive stimuli (there are consistent brain processes already after 50-100 ms post-stimulus), but you can also monitor brain states reflecting engagement, motivation or drowsiness over longer periods (hours to days).