Please check back to this section as updated timing benchmark results will be posted for the devices/machines that PST has tested.Į-Prime 1.2 Stimulus Device Response Timing Values Sound cards are even more prone to the same variability. Our preliminary timing tests have shown a wide range of variability between devices of the same class. PST has undergone a number of timing tests with a number of PS/2 and USB keyboards and mice. For detailed results of our timing tests and more information on what the results mean to you, please review TIMING: E-Prime Timing Test Results and OVERVIEW: Timing in E-Prime. Using our Automatic Time Audit technology is likely the only way you can be sure of your timing accuracy without adding expensive specialized hardware. mean display duration 109.4 ms, SD 0.49 ms). Even more important, we have added a major innovation, Automatic Time Audit Logging, that records your timing precision in an easy to review/analyze method (e.g. We have developed and implemented within E-Prime, special timing systems that deliver high timing accuracy (e.g., our millisecond tick miss rate is down to 0.005% on a mid range Pentium 266, millisecond timing accuracy of 99.995%). This means that timing via conventional programming reading a microsecond clock can be wrong at the millisecond level most of the time. miss rates on a Pentium 60 of 58% and Pentium 500 of 43%). In our tests normal programs miss millisecond events much of the time (e.g. Windows takes over control of your computer at times to do operating system maintenance this can be minimized but not blocked completely (remember the operating system has the highest priority). Our tests show that E-Prime is accurate for millisecond precision timing. We have conducted thousands of timing tests on computers ranging from Pentium 60s - Pentium 500s with Pentium, Celeron, and AMD microprocessors on variety of cards and software methods. PST encourages all machines expected to collect subject data to run the RefreshClockTest to verify their ability to collect critical trial data. Verify subject data stations with RefreshClockTest For more information, please consult the 'Critical Timing' chapter in the E-Prime documentation. Using the 1% rule, almost all machines that meet the system recommendations will be capable of collecting critical trial data. What exactly does this mean? For example in the RefreshClockTest experiment used to verify and evaluate subject station timing capabilities, an E-Prime 1.2 supported machine is likely to have a larger maximum missed tick, but less of them in comparison to the same machine running an unsupported version of E-Prime 2.0. For a full listing of Operating Systems that PST has thoroughly tested with E-Prime 1.2 for timing accuracy, please see the following Knowledge Base article: INFO: Operating system (Windows 10, Windows 8.1, Windows 8, Windows 7, Vista, and XP) support in E-Prime. When these instances occur, E-Prime continues to accurately timestamp so that post-analysis can filter the trials correctly.Į-Prime 1.2 and Operating System CompatibilityĪs stated above, E-Prime reports timing accuracy to the millisecond precision level. Although E-Prime coordinates with the operating system and external devices to continually have control of the computer's execution, the operating system or other devices can take control at any time, which will cause an experiment to be suspended while the operating system task is completed. This article is dedicated to issues regarding critical timing using the E-Prime 1.2 software package.Į-Prime reports timing accuracy to the millisecond precision level. Welcome to the E-Prime 1.2 timing Knowledge Base article.
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