A COMPARATIVE STUDY OF AVERAGE REFERENCE AND ROUTINE MONOPOLAR EAR LOBE REFERENCE ELECTRODES IN EEG RECORDING

摘要

It seems to us that there has not been a paper about Average Reference Electrode Method since the publication by Goldman' and Offner2 in 1950. From the results mentioned above, comparing with MP, characteristics of Ave. R. are:(1) In many cases, localized EEG abnormality was more clearly represented.(2) As to non-focal EEG abnormality, records which are very useful to diagnosis can be obtained, except a extremely low amplitude brain potential.(3) Since Ave. R. did not use ear lobe as reference, the electrical activity in temporal region was easily observed, and artifact by abnormal electrical activity did not take place.(4) Physiological artifact was difficult to mix. On the other hand, alternative current artifact tended to slightly mix on some occasions. Since amplitude was represented lowerly than the case in which ear lobe was used as reference electrode, it is not suitable to record low amplitude.From those results, it can be emphasized that Ave. R. is much more helpful for localizing space taking lesion of the brain than MP. And we convince that accuracy of EEG diagnosis can be increased by using Ave. R.