Which electrode site is located 10% above the inion?

The correct answer indicates the electrode site known as Oz, which is typically positioned on the scalp at the occipital region. This site is specifically located approximately 10% above the inion, which is the anatomical landmark at the base of the skull.

Understanding the placement of electrode sites is crucial for accurate EEG recordings, as each site corresponds to specific areas of brain activity. The Oz electrode helps monitor the electrical activity occurring in the occipital lobe, an area responsible for processing visual information.

The other choices correspond to different electrode positions that are not located above the inion. Fpz is positioned on the forehead, T3 and T4 are located on the lateral aspects of the temporal lobes, neither of which are relevant to the site being questioned.