Eyelink Saccade Sensitivity

The default “Normal” sensitivity is likely appropriate for the noisier long-range-optic MR recording.

2.4.1.2 Camera Setup Screen Main Functions
[saccade sensitivity setup toggle image]
Define the sensitivity of the EyeLink 1000 Plus parser for saccade event generation. Normal is intended for cognitive tasks like reading; while High is intended for psychophysical tasks where small saccades must be detected. See Section 4.3.3 Saccadic Thresholds for details of event parsing.
4.3.5 Saccadic Thresholds
Acceleration data has much more noise than velocity data, and thresholds of 4000°/sec2 for small saccade detection and 8000°/sec2 for reading and cognitive research are recommended. Lower acceleration thresholds will produce false saccade reports.

Here is an example of high sensitivity for an anti-saccade task. X axis is time, Y axis is horizontal gaze position. Bottom rectangles indicate interval labeled as a saccade in the initial output data (edf file). We see data labeled as a saccade before the actual event, likley just do to position noise.

confirm eyelink saccade labels can be regenerated with collected gaze position alone

I think the raw time series used for the accel calc are collected and reported in the same file. So we can go back and derive acceleration and redo the saccade labels (?) But, at the very least, life's easier if the labels we start with work for scoring without additional intervention