hi,
i need the white background of my bitmaps to be transparent, so that several bitmaps can be viewed simultaneously one on top of the other.
after some investigation i gathered that the...

that's exactly what i did. what do you think?

because i'm using compound screens, drawing the stimuli from a stimlist wouldn't work in my case.
after some thinking & consulting, i implemented the following solution:

since there are exactly...

hi,
during the practice phase of my experiment, if the subject responds incorrectly, i want to show an "error" message, and then repeat the same trial again and again until he/she responds...

i just wanted to make sure that this solution will work consistently, because it is undocumented (at least from the search i made in the help files)

i just wanted to make sure that this solution will work consistently, because it is undocumented (at least from the search i made in the help files)

in that case can i run several input files together (so that i won't have to be present and switch files manually in the middle for every participant)

the proportion is 4 A-type trials to 1 B-type trial. so it can be AAAAAAABABA etc.

hi,
i have a trial which awaits a key response, and then in some cases (depending on the key the participant pressed) i want to jump to another trial ,which displays a text on the screen, BUT...

hi,
i need to have 2 blocks of bgr. that is, 3 groups should be randomized, then a new block starts and 10 other groups need to be randomized, but there must be NO randomization between the 3 groups...

hi,
in my experiment i have 2 types of trials, A-trials and B-trials. both trial types should all be randomized within each other (i.e they are all treated as one group for wgr). BUT i also need to...

hi,
in my experiment, i want to allow any key press in order to proceed to the next trial, BUT only one key is the correct key. for all other keys, before proceeding to the next trial, i want to...

hi,
in my experiment, i want to allow any key press in order to proceed to the next trial, BUT only one key is the correct key. for all other keys, before proceeding to the next trial, i want to...