Description Origine of seizure Example EEG
Thalamocortical
dysfunction
Synchronous
AND
Symmetry
E.g. GPDs
Focal generator and
limited on one side
(may include the
midline Fz, Cz,Fz
leads)
E.g. LPDs
Focal generators
trigger the 2nd
bilateral
synchrony ->
1. Synchronous but
asymmetrical: The
originating side has
a higher amplitude
because it is closer
to the generator
e.g.
LPDs with
Bilateral
asymmetry
2. Asynchronous
after identifying the
subtle “consistent”
lead in the
originating side.
E.g.
LSWs with
Bilateral
asynchrony
