## Setting stimuli set at block level, as opposed to trial level

##### Setting stimuli set at block level, as opposed to trial level
 Author Message sdandeneau Group: Forum Members Posts: 37, Visits: 136 I'm running a task that requires counterbalancing stimuli sets across participants. Ex. Part. 1 gets. set 1 for bloc 1 and set 2 for block 2, whereas Part. 2 get set 2 for bloc 1 and set 1 for block 2. My question: instead of creating trial1 and trial 2 - and block 1(which runs trial 1) and block 2 (which runs bloc 2). Both trials are the same the blocks... the only difference is that stimuli used to run the trial. Is it possible to define the Trial once, but in the Block defining the stimuli set that should be used to run the trial?Something like: / trials = [1-4=trial]/ values.stimuliset = 1/ trials = [1-4=trial]/ values.stimuliset = 2Thanks in advanceStéphane Dave posted 4 Years Ago ANSWER Group: Administrators Posts: 11K, Visits: 70K +xsdandeneau - Thursday, February 9, 2017I'm running a task that requires counterbalancing stimuli sets across participants. Ex. Part. 1 gets. set 1 for bloc 1 and set 2 for block 2, whereas Part. 2 get set 2 for bloc 1 and set 1 for block 2. My question: instead of creating trial1 and trial 2 - and block 1(which runs trial 1) and block 2 (which runs bloc 2). Both trials are the same the blocks... the only difference is that stimuli used to run the trial. Is it possible to define the Trial once, but in the Block defining the stimuli set that should be used to run the trial?Something like: / trials = [1-4=trial]/ values.stimuliset = 1/ trials = [1-4=trial]/ values.stimuliset = 2Thanks in advanceStéphaneYes, you can achieve that by using nested elements://counterbalancing://set 1 first/ subjects = (1 of 2)/ groupassignment = groupnumber/ blocks = [1=set1; 2=set2]//set 2 first/ subjects = (2 of 2)/ groupassignment = groupnumber/ blocks = [1=set2; 2=set1]/ onblockbegin = [values.set = 1]/ trials = [1-4=mytrial]/ onblockbegin = [values.set = 2]/ trials = [1-4=mytrial]/ stimulusframes = [1=mytext]/ validresponse = (57)/ items = myitems/ select = list.setlist.nextvalue/ 1 = "Set 1 Item 1"/ 2 = "Set 1 Item 2"/ 3 = "Set 1 Item 3"/ 4 = "Set 1 Item 4"/ 5 = "Set 2 Item 1"/ 6 = "Set 2 Item 2"/ 7 = "Set 2 Item 3"/ 8 = "Set 2 Item 4"//list of lists returns an item number fromt the set list indicated by values.set/ items = (list.set1items.nextvalue, list.set2items.nextvalue)/ selectionmode = values.set//set 1 are item numbers 1 to 4/ items = (1,2,3,4)//set 2 are item numbers 5 to 8/ items = (5,6,7,8)/ set = 1 Edited 4 Years Ago by Dave sdandeneau Group: Forum Members Posts: 37, Visits: 136 +xDave - Thursday, February 9, 2017+xsdandeneau - Thursday, February 9, 2017I'm running a task that requires counterbalancing stimuli sets across participants. Ex. Part. 1 gets. set 1 for bloc 1 and set 2 for block 2, whereas Part. 2 get set 2 for bloc 1 and set 1 for block 2. My question: instead of creating trial1 and trial 2 - and block 1(which runs trial 1) and block 2 (which runs bloc 2). Both trials are the same the blocks... the only difference is that stimuli used to run the trial. Is it possible to define the Trial once, but in the Block defining the stimuli set that should be used to run the trial?Something like: / trials = [1-4=trial]/ values.stimuliset = 1/ trials = [1-4=trial]/ values.stimuliset = 2Thanks in advanceStéphaneYes, you can achieve that by using nested elements://counterbalancing://set 1 first/ subjects = (1 of 2)/ groupassignment = groupnumber/ blocks = [1=set1; 2=set2]//set 2 first/ subjects = (2 of 2)/ groupassignment = groupnumber/ blocks = [1=set2; 2=set1]/ onblockbegin = [values.set = 1]/ trials = [1-4=mytrial]/ onblockbegin = [values.set = 2]/ trials = [1-4=mytrial]/ stimulusframes = [1=mytext]/ validresponse = (57)/ items = myitems/ select = list.setlist.nextvalue/ 1 = "Set 1 Item 1"/ 2 = "Set 1 Item 2"/ 3 = "Set 1 Item 3"/ 4 = "Set 1 Item 4"/ 5 = "Set 2 Item 1"/ 6 = "Set 2 Item 2"/ 7 = "Set 2 Item 3"/ 8 = "Set 2 Item 4"//list of lists returns an item number fromt the set list indicated by values.set/ items = (list.set1items.nextvalue, list.set2items.nextvalue)/ selectionmode = values.set//set 1 are item numbers 1 to 4/ items = (1,2,3,4)//set 2 are item numbers 5 to 8/ items = (5,6,7,8)/ set = 1Thanks! That'll do the trick for me!

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