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Practical considerations in the positioning of EEG electrodes
Electroencephalography and Clinical Neurophysiology
|April 1, 1982
Summary
The 10-20 system for electroencephalography (EEG) placement has ambiguities and limitations. Modifications are proposed to improve accuracy and coverage of the cerebral cortex for better epilepsy diagnosis.
Area of Science:
- Neuroscience
- Biomedical Engineering
Background:
- The International Federation's 10-20 system is a standard for electroencephalography (EEG) electrode placement.
- Limited critical evaluation and proposed improvements for the 10-20 system exist in published literature.
Purpose of the Study:
- To identify and address inherent ambiguities and limitations within the 10-20 system.
- To propose modifications to the 10-20 system for enhanced accuracy and coverage.
Main Methods:
- Analysis of cranial measurements in 20 normal adults to assess 10-20 system criteria adherence.
- Evaluation of fronto-temporal epileptiform phenomena in 100 subjects to determine optimal electrode placement.
Main Results:
- Less than half of adult skulls met the strict symmetrical measurement criteria for the 10-20 system.
- Standard 10-20 placements cover less than three-quarters of the cerebral convexity.
- Epileptiform activity maxima were often observed 20 mm below standard F7/F8 positions.
Conclusions:
- The 10-20 system exhibits significant limitations in strict applicability and anatomical coverage.
- Modifications to the 10-20 system are necessary to improve the detection of neurological phenomena, particularly in the temporal regions.