Measuring experimental software timing errors in the presentation of visual stimuli
P. Garaizar, M. A. Vadillo, Helena Matute · PsycEXTRA Dataset · 2011
Nowadays psychology researchers have a wide range of experimental software alternatives to present devices used for the presentation of the stimuli have low refresh rate (typically at 60-85 Hz) and the Figure 1. Representation of the refreshing process in a CRT display. This process is Method An array of specialized software for delivering visual stimuli accurately on PCs was tested using slightly different in TFT displays, but both types of displays are constrained by their refresh rates (1 tick = 16.67 ms at 60 Hz). Therefore, visual changes with durations shorter than the vertical synchronization signal (VSYNC) interval should not be scheduled. Figure 3. Presentation and measurement equipment. Figure 5. Black-to-white animations used in the tests [6]. Each animation was scheduled to be repeated with frame durations of t=16.67 ms, t=50 ms, t=100 ms, t=200 ms, t=500 ms, and t=1000 ms, in 5 independent series of 60 seconds. In order to discard