H. Shigeto et al., JERK-LOCKED BACK AVERAGING AND DIPOLE SOURCE LOCALIZATION OF MAGNETOENCEPHALOGRAPHIC TRANSIENTS IN A PATIENT WITH EPILEPSIA PARTIALIS CONTINUA, Electroencephalography and clinical neurophysiology, 103(4), 1997, pp. 440-444
In order to localize the generator site of epileptiform discharges, we
applied the techniques of jerk-locked back averaging (JBA) of magneto
encephalographic (MEG) activities and dipole source localization in a
patient with epilepsia partialis continua (EPC), who showed continuous
, focal myoclonic jerks in the right arm. The myoclonic discharges in
the right thenar muscle were used as a trigger pulse. JBA revealed con
sistent EEG and MEG transients that coincided consistently and constan
tly preceded the myoclonic jerks. The estimated dipoles of MEG were lo
calized in a restricted area in the left precentral area, which closel
y correlated with the area of epileptic discharges recorded in electro
corticography. Therefore, JBA of MEG is considered to be a useful non-
invasive method for localizing the epileptogenic area in EPC. (C) 1997
Elsevier Science ireland Ltd.