My experiment involves ppts judging whether pairings shown are a match or not. Each ppt has a different 3 pairings that they need to learn. However, there are 9 possible pairings. I believe I have worked out how to create a random assignment of pairings for each ppt.
<counter mycounter>
/ select = noreplace(1,2,3,4,5,6,7,8,9)
/ selectionrate = experiment
</counter>
<item pictures>
/1="ECircle.png"
/2="EDiamond.png"
/3="EHexagon.png"
/4="EOctagon.png"
/5="EOval.png"
/6="EPentagon.png"
/7="ERectangle.png"
/8="ESquare.png"
/9="ETriangle.png"
</item>
<picture Pic1>
/items = pictures
/select = mycounter
/position = (50%, 35%)
</picture>
<picture Pic2>
/items = pictures
/select = mycounter
/ position = (50%, 35%)
</picture>
<picture Pic3>
/items = pictures
/select = mycounter
/ position = (50%, 35%)
</picture>
This seems to work, but not sure if there is a way to ensure that the same picture isn't duplicated - think it works with noreplace but not certain.
The issue I am having is that the instruction page needs to show the pictures in a different position.
<trial trial_pra_selfpace_demo>
/stimulustimes = [0=txt_pra_selfpace_instr, txt_instr_key, pic_instr_L, pic_instr_M, pic_instr_R, txt_instr_L, txt_instr_M, txt_instr_R, fixation_L, fixation_R, fixation]
/ validresponse = (57)
/ correctresponse = (57)
</trial>
## instr_Picture
<picture pic_instr_L>
/ items = picture.Pic1
/ position = (30%, 35%)
</picture>
<picture pic_instr_M>
/items = picture.Pic2
/ position = (50%, 35%)
</picture>
<picture pic_instr_R>
/items = picture.Pic3
/ position = (70%, 35%)
</picture>
However this leads to the error that the pictures (picture.Pic1, picture.Pic2, picture.Pic3) could not be located. Is this because it is a random assignment rather than one set image? Are there any ways I could overcome this? Is there a way I could display Pic1, Pic2, Pic3 side by side on one instruction screen.
Many thanks, Naomi