Millisecond Forums

Hello,

I'm programming a variation of a Posner Spatial Cuing Task and I'm having some trouble with randomizing images.  I have four conditions, each with 76 images, that are displayed on the left or the right side of the screen followed by a probe that displays on the left or right side of the screen.  I want the images to be randomly presented, presented on the left for 38 times and on the right for 38 times, and the probe to be random as well. I currently have some script but need to know how to do random no-replace for the picture, picture's side, and the probes position or what else I'm doing wrong.

Here's my code for the picture:
<list WIfaces>
/items = (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76)
/ replace = false
</list>

for the probe's position:
<list WIfacestargetpositions>
/items = (1, 1, 1, 1, 1, 2, 2, 2, 2, 2)
/ selectionmode = list.WIfaces.currentindex
</list>

for the probe's congruence:
<list WIfacestargetcongruence>
/ items = (1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2)
/ selectionmode = list.WIfaces.currentindex
</list>

and one of my condition's trial:
<trial WIfaces>
/ ontrialbegin = [values.valid = 0; values.validcorrect = 0; values.trialcount += 1; values.category="WIfaces"]
/ ontrialbegin = [values.itemnumber = list.WIfaces.nextvalue]
/ ontrialbegin = [values.target_position = list.wifacestargetpositions.nextvalue]
/ ontrialbegin = [values.congruence = list.WIfacestargetcongruence.nextvalue]

/ ontrialbegin = [if (values.target_position == 1) {values.target_x = values.target_left_x}
else {values.target_x = values.target_right_x; values.comp_x = values.target_left_x}]
/ ontrialbegin = [if (values.congruence == 1) {values.probe_x = values.target_x} else {values.probe_x = values.comp_x}]

/ ontrialbegin = [trial.WIfaces.insertstimulustime(shape.eraser, values.fixationduration)]
/ ontrialbegin = [trial.WIfaces.insertstimulustime(picture.WIfaces, values.fixationduration)]
/ ontrialbegin = [trial.WIfaces.insertstimulustime(shape.eraser, (values.fixationduration + values.targetduration))]
/ ontrialbegin = [trial.WIfaces.insertstimulustime(text.probe, (values.fixationduration + values.targetduration + values.TP_isi))]
/ ontrialend = [trial.WIfaces.resetstimulusframes()]
/ stimulusframes = [1 = fixation]
/ beginresponsetime = values.fixationduration + values.targetduration + values.TP_ISI
/ responseinterrupt = immediate
/ isvalidresponse = [trial.WIfaces.response == values.responsekey_left || trial.WIfaces.response == values.responsekey_right]
/ iscorrectresponse = [(values.probe_x == values.target_left_x && trial.WIfaces.response == values.responsekey_left) ||
(values.probe_x == values.target_right_x && trial.WIfaces.response == values.responsekey_right)]
/ monkeyresponse = (18, 23)
/ ontrialend = [values.target_image = picture.WIfaces.currentitem]

/ ontrialend = [if (trial.WIfaces.latency >= values.minimum_latency) values.valid = 1]
/ ontrialend = [if (values.valid == 1 && trial.WIfaces.correct) values.validcorrect = 1]
/ ontrialend = [if (values.validcorrect == 1) {values.sumcorrect += 1; values.sumrt += trial.WIfaces.latency}]
/ ontrialend = [if (values.congruence == 1) values.count_congruent_WIfaces += 1 else values.count_incongruent_WIfaces += 1]
/ ontrialend = [if (values.validcorrect == 1 && values.congruence == 1) {values.sumcorrect_congruent_WIfaces += 1; values.sumrt_congruent_WIfaces += trial.WIfaces.latency}]
/ ontrialend = [if (values.validcorrect == 1 && values.congruence == 2) {values.sumcorrect_incongruent_WIfaces += 1; values.sumrt_incongruent_WIfaces += trial.WIfaces.latency}]

/ timeout = (values.fixationduration + values.targetduration + values.TP_ISI+ values.probeduration)
/ posttrialpause = values.iti
</trial>

Thank you for your help!