Table 3.

Clinical staging matched to EEG: the EEG background also correlates with the clinic starting from a normal background with over-inscription of the periodic complexes up to a de-structuring of the EEG activity

Stages 1 A, 1B	Normal background, more common presence of periodic complexes and anterior delta
Stages 2 A, 2B, 2 C, 2D	Normal background, much more common presence of periodic complexes and anterior delta Focal slowing in 50% of cases Epileptogenic activity increasing from stages 2 A to 2 C, less evident by stage 2D
Stage 3	Abnormal background, less common presence of periodic complexes and anterior delta
Stage 4	Abnormal background, absence of periodic complexes and anterior delta