I'm working on a game that will be used as a spatial navigation task for fMRI & MEG research, and so I need to be able to output a logfile with extremely precise timing. From what I understand, ticks are a constant 1/16 of a second, and so total_ticks/16 should be a decent measure at least providing timing information to +/- 62.5 ms. There's also a timer function for information within one frame cycle, but this won't be suitable for longer periods of time such as a five minute scan of the brain. Is there a way to achieve more accurate timing precision than working in ticks? Also, are ticks an absolute constant of 1/16 of a second that can be relied on for this?