Marker Tracking & Eye Tracking

Laboratory experiments in psychology are often criticized for being far from reality. To achieve higher ecological validity, mobile research equipment can be used. Eye tracking glasses, for example, allow us to study gaze behavior in natural situations. The main problem with using such devices is mapping gaze coordinates onto actual stimuli (or a reference image …

Blink Removal From Pupil Diameter Data

When dealing with gaze data, a velocity-based filter is typically used to identify fixations from raw samples. In this article I will talk about using a similar filter to identify blinks and other artifacts in pupil diameter data. I have seen this procedure described in an article by Mathôt (2013). Basically, the algorithm should calculate sample-to-sample …