How to detect fixations vs. saccades?

[DougNS]

I am looking at the API (http://dev.theeyetribe.com/api/) and can't figure out how to differentiate fixations from saccades. Is this device capable of detecting a fixation? Other eye trackers (e.g., Arrington, ASL) provide this information, usually based on a pupil velocity below a certain threshold.

In our scenario, we only analyze position if the user is fixated.

Doug Girard
Nirodha Software

[Martin]

Each JSON frame-object coming over the API has a "fix" field (boolean).

[jischnei]

Each JSON frame-object coming over the API has a "fix" field (boolean).

I am also new to the EyeTribe and can't find this information either. I have seen the "fix" field, but I also have not found how the device determines a fixation. I would love to know! Thanks!