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This means the item chosen for the above element depends on the item chosen for <picture white_pics>. Now look at one relevant <trial>:

<trial testaw>

/ stimulusframes = [1=accept_pics,AcceptButton,RejectButton,white_pics]

/ correctresponse = (AcceptButton)

/ validresponse = (AcceptButton,RejectButton)

</trial>

Which element is used first? You've got the dependency the wrong way round.

Also:

<trial testab>

/ stimulusframes = [1=accept_pics,AcceptButton,RejectButton,black_pics]

/ correctresponse = (AcceptButton)

/ validresponse = (AcceptButton,RejectButton)

</trial>

We have already established above that the item used by <picture accept_pics> depends on <picture white_pics>. It has no relation whatsoever to <picture black_pics>, so the above <trial> definition does not make any sense.

I think you need to take a step back. Forget about setting up pairs randomly for the moment. Instead just take the 1st 10 white pics and pair them with the 1st 10 accept stims, take the next 10 white pics and pair them with the 1st 10 reject items (and so forth for the black pics). Once you've got that set up, adding in the random pair generation is easy.

Yes, I have tried to institute some dependencies but none of them have been able to solve the problem. It only seems to increase repetitions of certain stimuli within blocks. I am likely just using them incorrectly.  Here is the current code I am working with...

<picture white_pics>

/ items = white_pics

/ select = noreplace

</picture>

<picture black_pics>

/ items = black_pics

/ select = noreplace

</picture>

<picture accept_pics>

/ items = accept_pics

/ select = current(white_pics)

</picture>

<picture reject_pics>

/ items = reject_pics

/ select = current(black_pics)

</picture>

You do realize that none of your <picture> elements have dependencies defined, don't you? As such there are no pairs that could possibly be maintained -- all your elements sample randomly without replacement from the items you feed into them.

You had the dependency right in your original post, now you've removed it.

I am sorry for not being clearer.  I would like the face-application pairings to repeat themselves across blocks.  That is, the combinations that occur during the orientation block (for example, the fifth White face and second Reject application) should also occur during the testing block.  Altering the resetinterval attribute does not appear to be maintaining the combinations.

If you want selection pools to be maintained across blocks, you need to make use of the /resetinterval attribute. Details can be found in the documentation.

However, given that you have 40 pairings *and* each block runs 40 trials (i.e. exhausts all of the pairings), how could they possibly *not* repeat???

I apologize for my inconsistencies-- I was trying to reformat the code to make it easier to understand.  Below is my attempt to solve the problem by specifying different picture and trial types, but it is still not giving me exactly what I am looking for.  

Within both the orientation and the test blocks, each face and each application only appears once, which is good.  The error comes in these face-application pairings not repeating themselves across blocks.  Thanks for your help...

<picture AcceptButton>

/items = ("Accept.jpg")

/ position = (75%,80%)

/size = (16%,16%)

</picture>

<picture RejectButton>

/items = ("Reject.jpg")

/ position = (25%,80%)

/size = (16%,16%)

</picture>

<picture accept_pics>

/ items = accept_pics

/ select = noreplace

</picture>

<picture reject_pics>

/ items = reject_pics

/ select = noreplace

</picture>

<picture white_pics>

/ items = white_pics

/ select = noreplace

</picture>

<picture black_pics>

/ items = black_pics

/ select = noreplace

</picture>

<item white_pics>

</item>

<item accept_pics>

</item>

<item black_pics>

</item>

<item reject_pics>

</item>

<counter setup_white_pics>

/ items = ("W1S.bmp", "W2S.bmp", "W3S.bmp", "W4S.bmp",

"W5S.bmp", "W6S.bmp", "W8S.bmp", "W9S.bmp",

"W11S.bmp", "W13S.bmp", "W19S.bmp", "W20S.bmp",

"W21S.bmp", "W23S.bmp", "W25S.bmp", "W26S.bmp",

"W28S.bmp", "W30S.bmp", "W31S.bmp", "W37S.bmp")

/ select = noreplace

/ selectionrate = trial

</counter>

<counter setup_black_pics>

/ items = ("B1S.bmp", "B2S.bmp", "B3S.bmp", "B4S.bmp",

"B5S.bmp", "B6S.bmp", "B8S.bmp", "B9S.bmp",

"B10S.bmp", "B12S.bmp", "B984S.bmp", "B985S.bmp",

"B986S.bmp", "B987S.bmp", "B988S.bmp", "B990S.bmp",

"B991S.bmp", "B993S.bmp", "B994S.bmp", "B997S.bmp")

/ select = noreplace

/ selectionrate = trial

</counter>

<counter setup_accept_pics>

/ items = ("App14_1Template.jpg", "App14_2Template.jpg", "App14_3Template.jpg", "App14_4Template.jpg",

"App14_5Template.jpg", "App14_6Template.jpg", "App14_7Template.jpg", "App14_8Template.jpg",

"App14_9Template.jpg", "App14_10Template.jpg", "App14_11Template.jpg", "App14_12Template.jpg",

"App14_13Template.jpg", "App14_14Template.jpg", "App14_15Template.jpg", "App14_16Template.jpg",

"App14_17Template.jpg", "App14_18Template.jpg", "App14_19Template.jpg", "App14_20Template.jpg")

/ select = noreplace

/ selectionrate = trial

</counter>

<counter setup_reject_pics>

/ items = ("App13_1Template.jpg", "App13_2Template.jpg", "App13_3Template.jpg", "App13_4Template.jpg",

"App13_5Template.jpg", "App13_6Template.jpg", "App13_7Template.jpg", "App13_8Template.jpg",

"App13_9Template.jpg", "App13_10Template.jpg", "App13_11Template.jpg", "App13_12Template.jpg",

"App13_13Template.jpg", "App13_14Template.jpg", "App13_15Template.jpg", "App13_16Template.jpg",

"App13_17Template.jpg", "App13_18Template.jpg", "App13_19Template.jpg", "App13_20Template.jpg")

/ select = noreplace

/ selectionrate = trial

</counter>

<trial setup_pairingsaw>

/ ontrialbegin = [item.white_pics.item=counter.setup_white_pics.selectedvalue]

/ ontrialbegin = [item.accept_pics.item=counter.setup_accept_pics.selectedvalue]

/ trialduration = 0

/ recorddata = false

</trial>

<trial setup_pairingsrw>

/ ontrialbegin = [item.white_pics.item=counter.setup_white_pics.selectedvalue]

/ ontrialbegin = [item.reject_pics.item=counter.setup_reject_pics.selectedvalue]

/ trialduration = 0

/ recorddata = false

</trial>

<trial setup_pairingsab>

/ ontrialbegin = [item.black_pics.item=counter.setup_black_pics.selectedvalue]

/ ontrialbegin = [item.accept_pics.item=counter.setup_accept_pics.selectedvalue]

/ trialduration = 0

/ recorddata = false

</trial>

<trial setup_pairingsrb>

/ ontrialbegin = [item.black_pics.item=counter.setup_black_pics.selectedvalue]

/ ontrialbegin = [item.reject_pics.item=counter.setup_reject_pics.selectedvalue]

/ trialduration = 0

/ recorddata = false

</trial>

<trial orientaw>

/ stimulusframes = [1=accept_pics,white_pics]

/timeout=500

</trial>

<trial orientrw>

/ stimulusframes = [1=reject_pics,white_pics]

/timeout=500

</trial>

<trial orientab>

/ stimulusframes = [1=accept_pics,black_pics]

/timeout=500

</trial>

<trial orientrb>

/ stimulusframes = [1=reject_pics,black_pics]

/timeout=500

</trial>

<trial testaw>

/ stimulusframes = [1=accept_pics,AcceptButton,RejectButton,white_pics]

/ correctresponse = (AcceptButton)

/ validresponse = (AcceptButton,RejectButton)

</trial>

<trial testrw>

/ stimulusframes = [1=reject_pics,AcceptButton,RejectButton,white_pics]

/ correctresponse = (RejectButton)

/ validresponse = (AcceptButton,RejectButton)

</trial>

<trial testab>

/ stimulusframes = [1=accept_pics,AcceptButton,RejectButton,black_pics]

/ correctresponse = (AcceptButton)

/ validresponse = (AcceptButton,RejectButton)

</trial>

<trial testrb>

/ stimulusframes = [1=reject_pics,AcceptButton,RejectButton,black_pics]

/ correctresponse = (RejectButton)

/ validresponse = (AcceptButton,RejectButton)

</trial>

<block pairings>

/ trials = [1-40=noreplace(setup_pairingsaw,setup_pairingsrw,setup_pairingsab,setup_pairingsrb)]

</block>

<block orient>

/ trials = [1-40=noreplace(orientaw,orientrw,orientab,orientrb)]

</block>

<block test>

/ trials = [1-40=noreplace(testaw,testrw,testab,testrb)]

</block>

#1: It would be helpful if you actually could elaborate on what isn't working. A blanket statement doesn't give anyone anything to work with.

#2: There are inconsistencies in the code you posted which make it impossible to figure anything out. For example, you give

but then reference completely different <picture> elements in your code:

#3: All your trials sample from those same <picture> elements:

These contain *the complete set* of 40 pairings you set up. There is no reason why e.g <trial orientaw> should sample an 'accept/white' pairing from this pool of 40 pairings. If you want your trials to do this, you need to write stuff to separate elements and have the respecitve trial use the "correct" ones.

Hello,

I was hoping someone could help me with a related problem to the one addressed in this post.  

In my study, I have 20 faces of White people and 20 faces of Black people.  Furthermore, I have 20 applications that should be 'accepted', and 20 that should be 'rejected'.  I would need to randomly generate pairings of 10 White/Accept, 10 White/Reject, 10 Black/Accept, 10 Black/Reject.

Furthermore, those pairings need to be created once at the beginning of the study so that participants can be shown them very quickly so as to see the full applicant pool, and then later those same pairings need to be shown again so the participant can make accept/reject decisions for each application/image pairing.  The code above was able to get me started, but I am pretty stumped.  Here is what I have.  Any suggestions would really help me out:

<picture face_pics>
/ items = face_pics
/ select = noreplace
[...]
</picture>

<picture application_pics>
/ items = application_pics
/ select = current(face_pics)
</picture>

<item face_pics>
</item>

<item application_pics>
</item>

Then, I made counters for each of the White, Black, Accept, Reject stimuli.

<counter setup_white_pics>

/ items = ("W1.bmp", "W2.bmp", "W3.bmp", "W4.bmp","W5.bmp","W6.bmp","W7.bmp","W8.bmp","W9.bmp","W10.bmp","W11.bmp", "W12.bmp", "W13.bmp", "W14.bmp","W15.bmp","W16.bmp","W17.bmp","W18.bmp",W19.bmp","W20.bmp")

/ select = noreplace

/ selectionrate = trial

</counter>

<counter setup_black_pics>

/ items = ("B1.bmp", "B2.bmp", "B3.bmp", "B4.bmp","B5.bmp","B6.bmp","B7.bmp","B8.bmp","B9.bmp","B10.bmp","B11.bmp", "B12.bmp", "B13.bmp", "B14.bmp","B15.bmp","B16.bmp","B17.bmp","B18.bmp",B19.bmp","B20.bmp")

/ select = noreplace

/ selectionrate = trial

</counter>

<counter setup_accept_pics>

/ items = ("Accept1.bmp", "Accept2.bmp", "Accept3.bmp", "Accept4.bmp","Accept5.bmp","Accept6.bmp","Accept7.bmp","Accept8.bmp","Accept9.bmp","Accept10.bmp","Accept11.bmp", "Accept12.bmp", "Accept13.bmp", "Accept14.bmp","Accept15.bmp","Accept16.bmp","Accept17.bmp","Accept18.bmp",Accept19.bmp","Accept20.bmp")

/ select = noreplace

/ selectionrate = trial

</counter>

<counter setup_reject_pics>

/ items = ("Reject1.bmp", "Reject2.bmp", "Reject3.bmp", "Reject4.bmp","Reject5.bmp","Reject6.bmp","Reject7.bmp","Reject8.bmp","Reject9.bmp","Reject10.bmp","Reject11.bmp", "Reject12.bmp", "Reject13.bmp", "Reject14.bmp","Reject15.bmp","Reject16.bmp","Reject17.bmp","Reject18.bmp",Reject19.bmp","Reject20.bmp")

/ select = noreplace

/ selectionrate = trial

</counter>

Then I made trial setup pairings for each of the four combinations

trial setup_pairingsaw>

/ ontrialbegin = [item.face_pics.item=counter.setup_white_pics.selectedvalue]

/ ontrialbegin = [item.application_pics.item=counter.setup_accept_pics.selectedvalue]

/ trialduration = 0

/ recorddata = false

</trial>

<trial setup_pairingsrw>

/ ontrialbegin = [item.face_pics.item=counter.setup_white_pics.selectedvalue]

/ ontrialbegin = [item.application_pics.item=counter.setup_reject_pics.selectedvalue]

/ trialduration = 0

/ recorddata = false

</trial>

<trial setup_pairingsab>

/ ontrialbegin = [item.face_pics.item=counter.setup_black_pics.selectedvalue]

/ ontrialbegin = [item.application_pics.item=counter.setup_accept_pics.selectedvalue]

/ trialduration = 0

/ recorddata = false

</trial>

<trial setup_pairingsrb>

/ ontrialbegin = [item.face_pics.item=counter.setup_black_pics.selectedvalue]

/ ontrialbegin = [item.application_pics.item=counter.setup_reject_pics.selectedvalue]

/ trialduration = 0

/ recorddata = false

</trial>

<block pairings>

/ trials = [1-40=noreplace(setup_pairingsaw, setup_pairingsrw, setup_pairingsab, setup_pairingsrb)]

</block>

Finally, I created trials and blocks for the initial 'Orientation' and the final 'Testing' session.

<trial orientaw>

/ stimulusframes = [1=app_pics,image_pics]

/timeout=500

</trial>

<trial orientrw>

/ stimulusframes = [1=app_pics,image_pics]

/timeout=500

</trial>

<trial orientab>

/ stimulusframes = [1=app_pics,image_pics]

/timeout=500

</trial>

<trial orientrb>

/ stimulusframes = [1=app_pics,image_pics]

/timeout=500

</trial>

<block orient>

/ trials = [1-40=noreplace(orientab,orientrb,orientaw,orientrw)]

</block>

<trial testab>

/ stimulusframes = [1=app_pics,AcceptButton,RejectButton,image_pics]

/ validresponse = (AcceptButton,RejectButton)

/timeout=100

</trial>

<trial testrb>

/ stimulusframes = [1=app_pics,AcceptButton,RejectButton,image_pics]

/ validresponse = (AcceptButton,RejectButton)

/timeout=100

</trial>

<trial testaw>

/ stimulusframes = [1=app_pics,AcceptButton,RejectButton,image_pics]

/ validresponse = (AcceptButton,RejectButton)

/timeout=100

</trial>

<trial testrw>

/ stimulusframes = [1=app_pics,AcceptButton,RejectButton,image_pics]

/ validresponse = (AcceptButton,RejectButton)

/timeout=100

</trial>

<block test>

/ trials = [1-40=noreplace(testab,testrb,testaw,testrw)]

</block>

<expt >

/blocks =  [1=pairings;2=orient; 3=test]

</expt>

This really isn't working and I am pretty stuck. Thanks for your help.

Unfortunately I do not have the script around anymore. However, the instructions in the original reply should be sufficient to get you going. I recommend you first reproduce those in a minimal test case script, then extend / apply to your own procedure.

Regards,

~Dave

Hi Dave, I have the same problem as RBalas. I tried the elements you described and at least I got them right in the sense that Inquisit does not complain. But I still have not solved the problem - the CS are still randomly assigned to the US withing the same participant. I probably did something wrong in one of the other elements. Unfortunately I could not open the script you attached. I guess that's what will solve my problem: I probably should only see an entire script that works so I can see what I did wrong within the other elements... Is your script still online? As I said I could not open it. Or is there anonther script that does the same?

Thank you and Greetings

Georg