10-20 system

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The 10-20 system is used in electroencephalography (EEG).

When examining with the EEG, electrodes are attached to specific locations on the skull surface to measure cortical electrical activity. However, since the shape and size of the skull is very different from person to person, a relative system had to be defined, which allows comparable results. Herbert Jasper invented such a system that is still in use today.

Drawing of the skull with the location of the nasion and the inion
Electrode positions
Electrode arrangement in the 10-20 EEG system

The skull bone is measured along the top of the skull from nasion to inion . The value of this route is assumed to be 100 percent. Now you split it up. From the nasion you go 10 percent in the direction of Inion, then four more 20 percent steps and at the end another 10 percent. Hence the name 10-20 system. The same is done on the line between the two pre-auricular points (in front of the ears). Based on these coordinates, the electrodes are attached to the scalp.

literature

  • Herbert H. Jasper: The ten-twenty electrode system of the International Federation . In: Electroencephalography and clinical neurophysiology . tape 10 , 1958, pp. 371-375 , doi : 10.1016 / 0013-4694 (58) 90053-1 (Appendix to the article Report of the committee on methods of clinical examination in electroencephalography . Pp. 370-375).

Web links

  • International 10-20 system PDF document with graphical representation of the 10-20 route sections and electrode positions in side and top view (72 kB)