Fragmented generalized spike-and-wave can appear focal or multi-focal but usually is not consistently seen in 1 area.
[medlink.com]
The EEG signature of IGE is bisynchronous, symmetric, and generalized spike-wave complex; although focal, irregular, and so called "fragments" of discharges are not uncommon
[ncbi.nlm.nih.gov]
The morphology of the focal spike-and-wave typically appears similar to the generalized spike-and-wave. Ictal.
[medlink.com]