These include periodic lateralising epileptiform discharges in encephalitis, frontal intermittent delta activity in toxic–metabolic or structural abnormalities (if asymmetrical
[doi.org]
Some other features, such as the presence of abnormal hyperintensity in the periaqueductal gray matter and posterior deep white matter tracts, were also common, and although
[ajnr.org]
Routine EEG activity is generally slowed and may demonstrate PSW complexes associated with myoclonus in patients with long disease duration.
[doi.org]