Can we tell differences by looking at EEG signal that person has open eye or close eye?
That's the most fundamental effect you observe with EEG: ALpha blockade aka Berger effect.
https://de.wikipedia.org/wiki/Berger-Effekt
Eyes closed lots of alpha, eyes open little alpha activity.
During eyes closed wake state we can see Alpha (8 to 12 Hz) activity more than 50 percent of the total 30 seconds epoch prominently in the occipital region where as during eyes open desynchronized activity is present which may consists of alpha, beta, slow waves activity and have no particular pattern. Only 90 percent of the people produce alpha waves during eyes closed wake state.
Hi Greeshma,
have a look at the attached figure found on (http://produceconsumerobot.com/thinkingcap/). You will find these strong waves that have a rhythm of 8 - 12 occurences (cycles) per second predominantly in occipital electrodes on the back of the head.
If you wish to learn more about it:
https://pdfs.semanticscholar.org/89be/697e18c5da35e3e87d2926731530ff5af119.pdf
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