Fig. 1.

Experimental design. Stimulation is applied to the implanted electrodes during testing, resulting in the appearance of ADs in some (but not all) ECoG channels. The patient is asked to answer an arithmetic question, which sometimes causes the ADs to stop. We analyze the approximately 4-second window of brain activity before the arithmetic question is asked as well as an approximately 4-second window after the question has been asked but before the ADs stop.