You can view the reaction times of participants in the text files saved after running your experiment.
By default, SuperLab will reset the Reaction Time timer at the onset of the first event in the trial. That is, the timer will begin at 0ms from the first event in the trial. The onset for Digital Output, ISI, Picture File, Serial Output, or Text events is after the event presentation is complete. The can be different for Audio, Movie, or Sound events, depending on what options you choose.
Unfortunately there isn’t a single document dedicated to reaction time, but you can try searching through our forums.
Here is a thread on accuracy of response times in 4.0 on Mac:
Here is a thread on reaction time calculation:
About the synchronization of the resonator’s trigger with SuperLab, I’ll ask Hisham to chime in since he’d be able to give you a better answer.
Please feel free to continue asking questions. I’ll be happy to help you with anything that I can.