large delay in pupillometry experiment
Hi all,
I am observing a delay of more than a second per trial in my pupillometry experiment. In total, my experiment lasts 40 minutes longer than it should. It seems to be caused by the pygaze_start_recording, pygaze_stop_recording and pygaze_log items. If I move the start and stop item to a block level instead of trial level, and I replace the log item with some inline code to log the variables, it is solved. I wonder whether others came across similar problems and whether there might be a simple explanation for it.
Cheers
Comments
Hi,
That is rather normal. The opening and closing of the eye tracker just takes time. However more than a second seems to be quite long. If I remember correctly, It took 700-800 ms for me.
So yeah, you want to move the start and stop recording to the block level rather than the trial level (unless you don't care about the delay, or can incorporate it in the ITI). This is particularly true if you run a pupil experiment (it is anyway recommend to record pupil over a longer time course, rather than the few seconds relevant for a trial).
Hope this helps,
Eduard