Asymmetric ESES with discharges seen more prominently over the left hemisphere, corresponding to unilateral structural injury; in this case, neonatal left thalamic stroke. Note the absence of spindles in left hemisphere further suggesting the possibility of thalamic injury. Recordings were obtained using standard international 10–20 electrode placement and a single electrocardiogram chest electrode. The recordings were obtained using a reference electrode and reformatted digitally into sequential bipolar and referential montages for review.