Change of eye-tracking frequency when using EThndl.calibrate(wpnt);

[md06451]

Hi all,
I am running readmeMinimal.m (https://github.com/dcnieho/Titta/blob/master/demo_experiments/readmeMinimal.m).
I am using a Tobii Pro Spark. I set the sampling frequency to 60. When I use the function EThndl.calibrate(wpnt), I notice that my sampling frequency goes to 33. This does not happen when I run other parts of the script excluding the calibration part (e.g. when I use other functions such as EThndl.sendMessage, EThndl.buffer.start, EThndl.buffer.stop, EThndl.collectSessionData; EThndl.saveData). What is the problem? I can of course set again the frequency prior to recording but I wonder why this is happening and if there is a way I can fix this.
Thanks in advance for your help
Martina

[dcnieho]

Hi Martina,

Thanks for your interest in Titta!

I have had a report of this before. I think Tobii is doing something strange during Spark calibration (there is not nothing in my code that affects sampling rate during calibration). I will contact them and ask, and if needed adjust sampling rate in my toolbox (I would want to already run validation at 60 Hz, not 33 Hz, and that not something you as a user would be able to fix).

I'll get back to you.

[md06451]

Super thank you so much for this !