Hello,
ok, that explains the problem ;-) I changed the code in the following manner:
<counter dot.counter>
/ items = (1,2)
/ select = noreplace
</counter>
<picture dot.hor.ver.pic>
/items = ("Stimuli/DotHor.png" , "Stimuli/DotVer.png")
/select = dot.counter
</picture>
<trial m.an.o.tar>
/ ontrialbegin = [picture.dot.pic.items.1 = getitem(picture.dot.hor.ver.pic, dot.counter)]
/ ontrialbegin = [{picture.m.neu.pic.vposition = 75%; picture.m.an.pic.vposition = 25%; picture.dot.pic.vposition = 25%}]
/ stimulusframes = [10 = fixation.pic; 55 = maske; 56 = m.neu.pic, m.an.pic; 58 = mask1.pic, mask2.pic; 65 = maske; 66 = dot.pic]
/ validresponse = ("F", "J")
/ correctresponse = ("F")
/ timeout = 3000
</trial>
Now, I only have to store the dot.counter in the data file. I guess the column "values.dot.counter" will do.
Thanks a lot for pointing me in the right direction.
Jens