Does Inquisit put an automatic 50ms gap between stimulus???
No. But you may be mistaken about how trial timings work / the interplay between the various components. For that, see the "How to Control Trial Duration and Inter-Trial Intervals" topic in the docs.
Sorry, I'm not following. (a) What's the relation to the trial-ratio question in this thread and (b) how would anyone know what code you are referring to (I don't see any of that posted)? Can you clarify? Otherwise I can't help here.
Looking through my code I do not see what the cause could be. It's just a random gap of ~100ms between marker data.
I am having a 100ms gap between the instructions and the beginning of a blank screen.
The instructions end when 0 key is pressed.I need it to be instant.
Yes, selection at the <block> level works according to the proportions given. See the examples in the documentation for the /trials attribute for details. One short example here (many more can be found by searching the forum):
/ trials = [1-10 = noreplace(a,a,b,b,b)]
will result in 4 'a' trials and 6 'b' trials in random order.
Another option is to use a <list> element for trial selection in the respective <block>s' /trials attribute. The desired trial-ratio can be specified via the <list>'s /itemprobabilities.
I have two stimuli that need to be displayed 250 times in total.
Image 1 = 48 times
Image 2 = 202 times
They must be randomized though.
Anyway to tell the block to do this?