Confusion detection with EEG signals

Do students always ask doubts when they are confused? How do you know if someone is confused? Confusions happen when we are not able to comprehend what we see/hear. EEG, which stands for electroencephalography, is a method to record the electrical activity of the brain using electrophysiological monitoring. This is done through non-invasive (in most cases) electrodes placed along the scalp that records the brain's spontaneous electrical activity over a period of time.