[edited from support email]
I am new to the internet psychological testing or reaction time, but very interested in the possibilities of empirisoft (found a thread on the web). A major question I have is whether reaction times can be obtained with any degree of accuracy. Do you happen to know about that topic? Can stimuli be locked to the screen refresh rate, or can the time that a stimulus really appears on the screen be recorded to improve precision (think of 60 Hz, gives a possible error of near 17 msec).