Thanks in advance!!!

I don’t know iMotions, but judging from your link they merely act as a reseller of other brands of eye trackers. As far as the software solutions go: The above describes open-source software, which comes as-is, and with limited support (it depends on volunteers). Commercial solutions often come with more support, but in general they tend to be less flexible, and obviously they are more expensive. (Again, though, I don’t know imotions, so have no clue about their software.)

Cheers,
Edwin

Very interesting research! Now I am using EyeTribe to capture the pupil diameter and gaze fixation duration. Could you give some detailed tutorial about how to get the fixation plot, heatmap and so on?

Thank you very much,

The second reason is more important, because it also extends to potential alternatives to the EyeTribe: The sampling rate of cheap eye trackers is not high enough to accurately measure saccadic parameters. You might be able to find out the endpoint accuracy (as a saccade to the wrong point is usually followed by a brief fixation there, or at least a measurable slowing of the eye), but there is simply too much variability on the measurement of saccadic starts to compute reliable saccadic reaction times. If you need those, you’re going to need a bigger boa… errr… tracker. That is: with a sample rate of at least 250 Hz, and preferably a lot higher.

Sorry for the disappointing answer! Sometimes there is no other way than dishing out more money, or having to go back on your initial idea and find a work-around. (For example: Could you do the same game with just fixation accuracy and manual response times?) Good luck!