Table 2. Comparison between intraoperative ECoG and extraoperative ECoG

	Intraoperative ECoG	Extraoperative ECoG
Place for ECoG recording	Operation room	Epilepsy monitoring unit
Recording time	Brief during surgery	Several days
Opportunity to detect interictal EDs	Lower	Higher
Opportunity to detect ictal EDs	Rare	Frequent
Risk of complications (e.g., infection)	Lower	Higher

ECoG: electrocorticography; EDs: epileptiform discharges.