Overview of using T1/T2 and 10-10 subtemporal electrode chains for localizing EEG abnormalities

Evaluation of seizure activity may require the addition of T1/T2 or a subtemporal chain of electrodes based on the 10-10 measurement system. Placement of additional electrodes helps to localize seizure activity in pre-surgical patients and to reveal areas of abnormality which cannot be easily discerned with International 10-20 System of electrode placement. The addition of extra electrodes can be confusing if multiple technologists are involved with the patient's care. Extra steps such as using labeled tape can help clarify what electrodes are being used for each patient. This paper will define correct electrode placement of T1/T2 and the subtemporal chain. It will also demonstrate how to record with specific montages using these electrodes and show their usefulness in localizing abnormalities.