Fig. 1
Experimental setup from one of the recording sites. Intracranial EEG (iEEG) data were transmitted from electrodes in the head, using touch-proof connectors to the data amplifier, and then to the base unit. Simultaneously, eye-tracking data, and behavioral data were collected via an eye-tracker and response box, respectively. The experimental PC sent photodiode pulses through the amplifier to the base unit. Extra efforts were made to standardize the acquisition setups and experimental context across the three laboratories. To that end, the same experimental setup was used across three laboratories, albeit with different amplifiers and eye-trackers. A shared standard operating procedure enabled comparable acquisition conditions across experimenters and labs. The above diagram corresponds to the experimental setup at Boston Children’s Hospital and Brigham and Women’s Hospital (Harvard Medical School). To ensure participants remained isolated from power sources, all computer systems (including eye-tracking equipment) were powered via an isolator box (NYU), an isolated ground outlet (WU), or a battery (HU). Wiring diagrams and further details for each laboratory are summarized in supplementary figures.
