Figure 1.

Overview of task and analysis technique. (A) Subjects completed a free recall task. In each trial, a series of 12 words were presented on a computer screen. Subjects then completed simple math problems for 20 s as a distractor. Subjects were then prompted to verbally recall words that they remembered from the current trial. (B) IEDs were detected within the intracranial EEG recordings, and brain activity surrounding each IED was analyzed. Changes in power were calculated by comparing the period from 2 to 1 s before the IED onset (pre-IED) to the period from 1 to 2 s after the IED onset (post-IED).