Reference chart

10-20 Electrode Placement

A quick visual reference for the 19 standard scalp sites of the international 10-20 EEG system.

Diagram of the international 10-20 EEG electrode placement system showing 19 scalp sites: Fp1, Fp2, F7, F3, Fz, F4, F8, T3, C3, Cz, C4, T4, T5, P3, Pz, P4, T6, O1, O2

The 19 electrode sites

The international 10-20 system places electrodes at 10% and 20% intervals of the distances between the nasion and inion and between the preauricular points. Letters denote the region: Fp (prefrontal), F (frontal), C (central), T (temporal), P (parietal), and O (occipital). “z” denotes the midline; odd numbers indicate the left hemisphere and even numbers the right.

Region	Electrode sites
Prefrontal	Fp1, Fp2
Frontal	F7, F3, Fz, F4, F8
Central	C3, Cz, C4
Temporal	T3, T4, T5, T6
Parietal	P3, Pz, P4
Occipital	O1, O2

T3/T4/T5/T6 correspond to T7/T8/P7/P8 in the modified 10-10 nomenclature.

For practical guidance, see EEG recording recommendations and How to Take an EEG.