Randomizing paired blocks of images

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Randomizing paired blocks of images

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beccabos	beccabos posted 11 Years Ago Topic Details Share Topic
Group: Forum Members Posts: 24, Visits: 59	Hello, I'm trying to program a choice task- I have three categories of images, that I've paired with each other in three blocks (Ha, Hb, Ub). Is there a way to randomize the presentation of all of these images… e.g., an equal likelihood that a pairing from any of these blocks will be presented next, instead of randomized sequentially by three separate blocks? I am not sure how to organize the trials to do this as they're currently set up… would I have to move all of the pairs to a single block to do that? Part of the current script is attached here. Thanks for the help! Best, Becca Attachments choice.docx (189 views, 68.00 KB)
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Dave	Dave posted 11 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 108K	There are no <block> elements at all in the code you attached. There are only three different <trial> elements -- <trial choicetrial_d1> to <trial choicetrial_d3> -- each apparently sampling from a given pair of stimulus elements -- <picture CATstrat_d1>/<picture CAT_d1> to <picture CATstrat_d3>/<picture CAT_d3>. There are 36 item pairs per category. Thus it should be as simple as doing <block myblock> / trials = [1-108 = noreplace(choicetrial_d1, choicetrial_d2, choicetrial_d3)] </block> which will give you 36 d1-trials, 36 d2-trials and 36 d3-trials in random order. If that's not what you are aiming for, please clarify. Edited 11 Years Ago by Dave
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beccabos	beccabos posted 11 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 24, Visits: 59	This is SO helpful, Dave- thank you!!! I really appreciate it… this is exactly what I was missing.
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