Inquisit is not behaving as I would expect but I have no idea why:
I have three stimulus pools coded as items that have my jpg files in them.
<item angryPics>
/ 1 ="004_o_m_a_a.jpg"
/ 2 ="004_o_m_a_b.jpg"
/ 3 ="066_y_m_a_a.jpg"
/ 4 ="066_y_m_a_b.jpg"
/ 5 ="079_o_f_a_a.jpg"
/ 6 ="079_o_f_a_b.jpg"
/ 7 ="140_y_f_a_a.jpg"
/ 8 ="140_y_f_a_b.jpg"
</item>
<item fearPics>
/ 1 ="004_o_m_f_a.jpg"
/ 2 ="004_o_m_f_b.jpg"
/ 3 ="066_y_m_f_a.jpg"
/ 4 ="066_y_m_f_b.jpg"
/ 5 ="079_o_f_f_a.jpg"
/ 6 ="079_o_f_f_b.jpg"
/ 7 ="140_y_f_f_a.jpg"
/ 8 ="140_y_f_f_b.jpg"
</item>
<item neutralPics>
/ 1 ="004_o_m_n_a.jpg"
/ 2 ="004_o_m_n_b.jpg"
/ 3 ="066_y_m_n_a.jpg"
/ 4 ="066_y_m_n_b.jpg"
/ 5 ="079_o_f_n_a.jpg"
/ 6 ="079_o_f_n_b.jpg"
/ 7 ="140_y_f_n_a.jpg"
/ 8 ="140_y_f_n_b.jpg"
</item>
I then have three pictures where these items are inserted using 'noreplace'
<picture CentralAngryPic>
/ items = angryPics
/ select =noreplace
/ size = (parameters.imageheight, parameters.imageheight)
</picture>
<picture CentralNeutralPic>
/ items = neutralPics
/ select =noreplace
/ size = (parameters.imageheight, parameters.imageheight)
</picture>
<picture CentralFearPic>
/ items = fearPics
/ select =noreplace
/ size = (parameters.imageheight, parameters.imageheight)
</picture>
I determine the trial type using a list:
<list trialselectionfaceType>
/items = (1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3)
/replace = false
/selectionmode=random
</list>
Then during the trial I insert the required pic.
<trial trialfaceCentralDistractor>
/ ontrialbegin = [
values.trialType = list.trialselectionfaceType.nextvalue;
if (values.trialType == 1){
trial.trialfaceCentralDistractor.insertstimulustime(picture.CentralAngryPic, values.fixationduration + parameters.blankduration);
values.currentPic = picture.CentralAngryPic.currentitem}
else if (values.trialType == 2){
trial.trialfaceCentralDistractor.insertstimulustime(picture.CentralFearPic, values.fixationduration + parameters.blankduration);
values.currentPic = picture.CentralFearPic.currentitem}
else if (values.trialType == 3){
trial.trialfaceCentralDistractor.insertstimulustime(picture.CentralNeutralPic, values.fixationduration + parameters.blankduration);
values.currentPic = picture.CentralNeutralPic.currentitem}
/ validresponse = (parameters.responsekey_Targethorizontal, parameters.responsekey_Targetvertical)
/ correctresponse = (values.correctResponse)
/ beginresponsetime = values.fixationduration + parameters.blankduration;
/ timeout = 2000 + values.fixationduration + parameters.blankduration;
/ ontrialend = [
trial.trialfaceCentralDistractor.resetstimulusframes();
</trial>
<block faceBlocksReward>
/trials = [1-48 = trialfaceCentralDistractor]
</block>
I am expecting each image to be shown exactly twice in each block. Each time the picture is called I expect it to insert one of the 8 pictures into the trial and then once the pool is empty, cycle through them again. But that is not what is happening. Even though I am getting 16 trials of each of the three conditions in each block, some pics are shown more than others.
What am I doing wrong??
Thank you for any advice