subliminal stimuli

[normanp]

I need to use a subliminal exposure time but can't get anything below 2 refreshes (33 ms at 800X600, 60Hz). I've been using a modified version of the new input file template ("untitled.csv"). I simply added a fixation point ("*") for 250ms followed by a "subliminal" word prime ("prime") for 15ms followed by the default "cat" and "dog" (rt:any). The log file shows a 33ms exposure time rather than the 15-17ms time I need. I've set the default style to 800x600. I've checked that my systems have a recent version of DirectX installed (9.0). I've tried specifying 15ms, 16ms, and 17ms. DirectRT clocks my refresh rate at 16.96ms or 58.96Hz. I have DirectRT version 2008.1.0.11.

I've attached the following:

DxDiag.txt
untitled.csv (the input file)
1_log.csv (the log file)

Please let me know what else I can try.
Thanks,
Norman