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Record screen + gaze

edited January 2021 in PyGaze


I'd like to use Pygaze for my master thesis where I plan to conduct a user study where the participants play multiple competitive games and analyse the non-verbal communication that occurs during the game.

Question is: Is it possible to record the gaze and the screen where the participant is playing the game at the same time?

So far, all the tutorials and examples I found always show some kind of stimulus as an image or video.

Or alternatively, can I record the gaze and synchronize it later with an external screen recording?

Thanks for the help


  • Hi Bedauerlich,

    Yes, in principal you can. The only thing you need is a common time line. To establish that, you need to know which time points of the screen recording correspond to which time points of the gaze recording. The bare minimum is to have a shared trigger in the beginning of the the games, but it would be much more accurate if you had regular triggers throughout, that you could use to synchronize the recordings.

    Sending triggers with pygaze is no problem at all, however, I am not familiar enough with screen capture to know whether you can annotate the recording, or include it in the meta data or whether there is some other way, to mark certain moments in time of the recording. Maybe you can try googling a bit about that issue in particular?

    Good luck,


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  • Hi,

    I am also interested in Screen and gaze recording at the same time/synchronizing screen gaze with external recording.

    Eduard, I am not sure what you mean by triggers; can you explain a bit more?

    Thanks for the help


  • Hi Alex,

    with triggers I mean events in the data file(s) that can be used as markers of time or events in the experiment. For example, every time that the stimulus appears on the screen, you want to send a trigger to the eye tracker to mark that event in the data file. If you don't do that, you end up with a long sequence of gaze positions without having a clue which sample belongs to which event on the screen. The same holds for responses and other events in the experiment (or simple time, if you mark every seconds or so)

    Does that clear things up?


    Buy Me A Coffee

  • Hey, for screen recording I usually use such service as It's the best.

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