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

[jarvis24]

What a dream post, Norman--all the info I could possible want and you have checked out all the relevant posts--nice

Unfortunately, I don't see a convenient answer for you. Your files are in perfect order and we ought to be seeing 16 or 17ms on the "prime" trials in your log data files (and of course, we are obviously not).

A few thoughts though..

1. Try specifying 10ms, just in case there is some doubt in DirectRT's mind that your system can handle 15-17ms. This might show it that you are very serious about the single refresh.

2. I noticed a couple red flags in your dxdiag.txt file:

Card name (Chip Type): Mobile Intel(R) 965 Express Chipset Family
Monitor: Plug and Play Monitor

Graphics chips built into the motherboard are a frequent cause of a system's inability to handle demanding display requests. I presume this is a laptop? If so, maybe you could look into seeing if there is a way to upgrade your graphics system either internally or externally (usb2 graphics card?).

I also noticed your monitor is not explicitly defined--you might find it helpful to specify it in the Windows display properties.

Finally, I noticed that it said that the DirectX display tests were canceled before completion--was there a reason for that?