Which electrode is placed at the nuchal region in the 10-20 system?

In the 10-20 system of electrode placement, the electrodes are positioned based on specific anatomical landmarks for consistent and repeatable placement across different individuals. The nuchal region, which refers to the area at the back of the neck, is typically associated with the occipital region of the brain where the occipital lobe is located.

The electrodes O1 and O2 are designated for the occipital region, which is directly involved in processing visual information and is situated at the back of the head. In this context, placing either O1 or O2 at the nuchal region aligns with the anatomical and functional significance of the occipital lobe in relation to the 10-20 system.

By understanding that O1 or O2 corresponds to electrode placements ideally suited for the occipital region, it reflects the standardized method of mapping the brain's electrical activity. This positioning ensures that recordings from these sites accurately capture the necessary neural signals associated with visual processing, further underscoring the importance of precise electrode placement in electroencephalography (EEG) studies.