The International 10-20 system 

Thank you! Very helpful presenter!!!!!!!

Sorry to disappoint, but the explanation is incorrect for marking T3 and T4. Measuring 10% marks above the preauricular points mark the horizontal line on which they are located. Their exact location is marked in the middle between Fpz and Oz. The ears are not in the exact same location on different people and races. Sometimes they can be a little bit posterior (back) or anterior (forward ) on the head and using the preauricular points only to mark T3 and T4 is incorrect.

Thank you so much. Your presentation was so concise - helped me grasp the concept (rather than merely reading the book). Thanks again.

Awesome !!!

Bonjour est il possible d avoir une traduction française, merci

I'm not sure where you get 21 from. I only see 19. Are there also electrodes at FPz and Oz?

Thank you so much for putting out this outstanding visual aid. It helped me tremendously in mastering this concept better. Keep up the great work!!😉

I see T5....is number 5 used in this 10-20 system?

There are electrodes in front of the ears.

where are P8, P7, T7 and T8?

Fpz and Oz are only landmarks, not electrodes