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Biomedical subjects

M Ebe

Publications and source records attributed to M Ebe.

At least 19 recordsLinked to original sources
PubMed1982

Elimination of EKG artifacts from EEGs recorded with balanced non-cephalic reference electrode method.

The EKG artifacts contaminating EEGs recorded by the balanced non-cephalic reference electrode system were removed from EEGs by using a device composed of a one channel averager and simple hardware. This device has the following advantages to the others which have been previously proposed: (1) it is possible by averaging of a few (i.e., 5) EKG artifacts in EEG records successfully with only one channel averaged EEG derived from an earlobe; (2) the averaged EKG pattern is able to follow rapid EKG pattern change due to altered body position; (3) the possibility of being affected by another kind of artifact was decreased, because the time of averaging process to obtain averaged EKG became shorter. A remaining problem in achieving a complete removal of EKG artifacts (maximally of 100 micro V) was beat-by-beat small changes in EKG wave forms due to the respiratory cycle. Therefore, it was felt that our method was sufficiently accurate for clinical examination of EEG.

Computers↗
PubMed1981

Some characteristics of sleep spindles derived from automatic analysis.

Sleep spindles in eight normal adults were analyzed automatically by a minicomputer. The accuracy of spindle detection was about 90%. Spindle wave frequency was measured by an approximation method for the spindle peaks; this method employed a quadratic equation on prior analog filtering. The accuracy of measurement was within 0.6 msec (SD 1). The average spindle wave frequency was about 13 Hz, but varied depending on the sleep stage and brain region. The frequency was highly variable and displayed no tendency. Concerning spindle duration, short spindles were followed by either short or long spindles, while long spindles rarely were followed by long ones. As sleep progressed, spindle duration tended to become shorter. There was a tendency for one long interval of spindle appearance not to be followed by another long interval of appearance. However, as sleep progressed, the interval of spindle appearance had a tendency to become prolonged.

Adult↗