I am trying to run an abbrevaited vigilance test which requires pulling in 2 images every 40 miliseconds for 6 - 2 minute intervals.
Ther problem is that there seems to be a time lag during the test and the images do not flash on the screen every 40 milliseconds. We initially tried bitmap files, then jpegs and then tried 16 bit bitmap files ( 500 Kb) but a 2 minute test is taking 2 minutes and 6 seconds which is giving extra time during the test to the participants which ultimately makes the test less challenging than it should be.
Have you any suggestions as what can be done to remove the time lag for these images?