Help with Subliminal Priming

[jarvis24]

I could open your log file but not the input file--can you double check that it was the correct input file?

In any case, looking at your log file it appears you have an initial stimulus that appears at the same time as the subliminal stimulus, yes? And then you take the RT?

If so, try a small modification whereby something occurs at the start of the trial other than the subliminal stim--e.g., a fixation stimulus like "XXXXX" for 100ms. And then, the rest of your trial...

It doesn't need to stay that way, I would just try that to see if it affects your likelihood of achieving 16ms. On some systems, 16ms (or less) can be hard to achieve on the very first stimulus presented within a given trial.

[Davidowj]

Thanks so much for your response.

I have attached the input file again. Hopefully it will open this time.

If it doesn;t work, here is a little more detail about what the task does (or is supposed to do):

yes, there is a stimulus that appears at the same time as the prime, but then the primed image is masked by a third stimulus. In other words, a red dot appears in the middle of the screen at the same time the prime is flashed above or below the dot followed quickly by a masking stimulus. (Subjects are told to press one key if the Image appears above the red dot and another key if the Image appears below the red dot--- the only image they are supposed to see is the masking stimulus).

Anyway, I will follow your suggestion and put a fixation stimulus first, and let you know what happens! Thanks again for your help,

Jenny