randomizing which stimuli appear during a block

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randomizing which stimuli appear during a block

randomizing which stimuli appear during a block

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Dave	Dave posted 2 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 105K	+x nc - 7/7/2023 Hi, I have 8 sets of pictures, and I want each of them to appear randomly in each of 8 blocks (no replacement). I did something like this (note: code not exact, because I am not currently able to access the script), but it doesn't seem to be working. Would you be able to advise? <list stimuli> /items = (picture.1, picture.2. picture.3., picture.4, picture.5, picture.6, picture.7, picture.8) /selectionrate = block /replace = false </list> <block test> /trials = [1=trial, 2 = trial2] /bgstim = stimulus1, stimulus2, stimulus3, list.stimuli </block> I know the above isn't quite right, but what I'm trying to do is include a randomly selected picture from the list as background stimuli within that block. I'm also trying to make sure that no picture appears more than once across 8 different blocks. You don't want a list. You want a <picture> element with eight items, set to random selection without replacement and /selectionrate set to block. I.e. <picture bgpic> / items = bgpicitems / select = noreplace / selectionrate = block </picture> <item bgpicitems> / 1 = "01.jpg" / 1 = "02.jpg" / 1 = "03.jpg" / 1 = "04.jpg" / 1 = "05.jpg" / 1 = "06.jpg" / 1 = "07.jpg" / 1 = "08.jpg" </item> <block exampleblock> / bgstim = (bgpic) / trials = [1=mytrial] </block> <trial mytrial> / validresponse = (57) </trial> <expt> / blocks = [1-8 = exampleblock] </expt>
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nc	nc posted 2 Years Ago Topic Details Share Topic
Group: Forum Members Posts: 39, Visits: 108	Hi, I have 8 sets of pictures, and I want each of them to appear randomly in each of 8 blocks (no replacement). I did something like this (note: code not exact, because I am not currently able to access the script), but it doesn't seem to be working. Would you be able to advise? <list stimuli> /items = (picture.1, picture.2. picture.3., picture.4, picture.5, picture.6, picture.7, picture.8) /selectionrate = block /replace = false </list> <block test> /trials = [1=trial, 2 = trial2] /bgstim = stimulus1, stimulus2, stimulus3, list.stimuli </block> I know the above isn't quite right, but what I'm trying to do is include a randomly selected picture from the list as background stimuli within that block. I'm also trying to make sure that no picture appears more than once across 8 different blocks.
	Reply Like 3