Inadequacy of the average reference for the topographic mapping of focal enhancements of brain potentials.

@article{Tomberg1990InadequacyOT,
  title={Inadequacy of the average reference for the topographic mapping of focal enhancements of brain potentials.},
  author={Claude Tomberg and Patrick No{\"e}l and Isamu Ozaki and John E. Desmedt},
  journal={Electroencephalography and clinical neurophysiology},
  year={1990},
  volume={77 4},
  pages={259-65}
}
The main reason for doing topographic mapping of EEG or evoked potentials is to assess regional changes in brain potentials. The use of an average reference is shown to have perverse effects in this relation, namely because it imposes on the recorded data a zero-centering effect which can reduce, eliminate or even reverse the focal changes of bit-mapped brain potentials. Concurrent studies on a true 3-shell head model suggest that such distortions of human EEG data occur because the average… CONTINUE READING

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