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  • Alright I found the solution. to really turn off opengl, it takes the command with an underscore, i.e. $expyriment.control.defaults.open_gl=0. Then it doesnt work anymore. The way I did it, apparently it doesnt turn opengl really off. Interestin…
  • Hmm, seems like they dont... Here's what I've done: in terminal $python $import expyriment $expyriment.control.run_test_suite() => 1) Visual stimulus presentation * horizontal dots like in attached figure [no color but looked more s…
  • So I've tested both (open gl 0 vs. 2) and ran a number of trials and collected the stimulus presentation times of 2 stimuli (A and B ) from the xpe file. Attached graphic shows the Inter-Stimulus Intervals (time B - time A), which were set to 1014 m…
  • Okay, so if open gl is turned off, it will update the screen at any state of the vertical retrace and just go on, with the code immediately. If it is on, it will wait until the retrace starts at the upper left, refresh the screen, and then go on wit…
  • Update: I did it now using pygame's pygame.key.get_pressed() command and the wait method for defining the speed of the moving slider.
  • Hmmm couldn't make it work for my purpose. During the waiting time until the keyup event happens, I don't see how I can continuously change and update the position of the slider on the screen... Is there a way to use the check method? I am thinking…