Hi @iriszhong, thanks for your query. Within the Tobii core SDK which is designed to operate with the Tobii EyeX Tracker, you have two fixation modes:
– Lightly filtered (i.e. the default) is an adaptive filter which is weighted based on the age of the gaze data points GazePointData and the velocity of the eye movements. This filter is designed to remove noise and at the same time being responsive to quick eye movements.
– Unfiltered where no filtering is performed by the Interaction Engine (except for the removal of invalid data points and the averaging of the gaze points from both eyes)
Accordingly, our Fixation Filters are custom built by Tobii and not applicable to a generic methodology such as IV-T, etc…
I hope this answers your query, but please let us know if we can be of any further assistance.