Arent de Jongh

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This study investigates the possible relevance of distribution and age variation of spontaneous theta activity (4–8 Hz) in normal subjects using magnetoencephalography (MEG) recordings. Spontaneous theta was recorded with a 151-channel MEG in healthy subjects; moreover, in a group of 10 subjects, simultaneous MEG-EEG was recorded in order to compare the two(More)
It was investigated if single dipole analysis of spontaneous fast waves (>8 Hz) can be used to determine the location of the epileptic focus. Automatic dipole analysis was applied to MEG data of 25 patients with intracranial tumors and epilepsy. The frequency range of 8-50 Hz was divided into standard EEG bands. MEG results were overlaid on the MRI scans of(More)
Objective: Brain tumors are frequently accompanied by abnormal low frequency magnetic activity (ALFMA). The prevalence and clinical meaning of ALFMA are not well known, although a relation with epileptic brain tissue has been suggested. We studied the prevalence, characteristics and clinical correlates of ALFMA in 20 patients with brain tumors. Methods: In(More)
About 20% of the patients suffering from epilepsy cannot be treated well by anti-epileptic drugs. In these patients it can be a good option to resect the epileptic zone. In patients with brain tumors which are surgically treated for the tumor it might certainly be a good option since the epileptic focus can be adjacent to and/or border on the tumor tissue.(More)
Two abnormalities in the spontaneous magnetic brain activity of patients with tumours and epilepsy are investigated: slow waves and inter-ictal spikes. Signal analysis techniques are demonstrated to localise their underlying generators, project these sources onto the patient’s MR scan and to compare their locations. The clinical importance of this study is(More)
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