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EyeLink is a series of research-grade eye trackers from SR Research that offers precise measurements of gaze and pupillary signals at high temporal resolution. EyeLink’s role in the NEDE system is to record eye positions and environmental events on a precise clock. To that end, NEDE includes a custom wrapper for the EyeLink SDK that allows Unity Scripts to exchange messages with the EyeLink’s computer. This allows both the logging of environmental events and gives Unity access to eye position during the experiment, allowing for gaze-contingent display events.