Defining Millisecond Accuracy
Operationally, E-Prime defines the interpretation of millisecond precision as the ability to report any reaction time or timing duration such that:
- A measured and reported timing precision standard deviation is less than half a millisecond.
- Recordings are within a millisecond from the time they are available to computer hardware. When errors occur, they should be detectable, should not increase measurement variance by more than 1 ms. The investigator should have a method available to identify and filter out timing data that is in error.
- Screen refreshes (displays of the full screen, described in detail below) can be tracked without misses 99.9% of the time, and misses can be detected and reported.
With such accuracy, researchers can be confident that they are reporting valid results of human behavior, and that those results will replicate between laboratories.