Our lab has been using Superlab for about 6 months. Once we got it up and running, the timing has been pretty perfect every time we’ve used it–our scripts last the expected time and end at the same time as the scanner.
During a scan yesterday, all of the scripts ended after the scanner (~4 seconds delayed). From looking at the log file, I can tell that the scripts lasted longer than they were supposed to last, so it wasn’t just that they were triggered late. There is no discrete event that took longer than usual; it seems a bit of time is added to each trial, so that halfway through the paradigm, we were at a 2 second delay. I ran them today outside the scanner and timed them and again they lasted longer than they should have.
What could be causing this? It seems to me that the computer has just started running slower, but I don’t understand why there would suddenly be such a dramatic shift. It’s a fairly new computer, and the day before, the scripts ran fine. There were no big downloads or updates or anything between the two days.
Any suggestions or ideas as to what may have happened?