Up until now we always used response boxes connected to the LPT-port for measuring reaction times. This gives us an accuracy of 0.1 milliseconds. Since LPT-ports are not that common anymore we are looking for alternatives. One of the alternatives we have tested is the RB-x30 response box, using Presentation with the provided extension. We have tested this box using a “hardware participant” that always gives the same response time. We noticed a jitter of 16ms (1 frame?) in reaction times (and 2 spikes with more jitter). See the attached jpg.
Is this the best possible accuracy we can get in Presentation, or should we get better results? The same setup / Presentation script is used testing the LPT-port, and this gives us a 0.1ms jitter.