Randomization Question (case 25685)

[jason_reed]

Are you trying to randomize the presentation of any, all, or some specific stimuli in each of the four blocks?

[syzergy]

Are you trying to randomize the presentation of any, all, or some specific stimuli in each of the four blocks?

Yes, the presentation of all of the stimuli in the blocks is randomized. I have groups of stimuli that have to be presented together and in order (e.g., instruction, image, scale response) and I?ve been grouping them together with the BGR column.

[jason_reed]

You should be able to accomplish this by first listing all stimuli and items within a block in the order you want them to appear in the .que file. Do this for all four blocks of ten stimuli and the 5 items corresponding to each stimulus.

Then, every stimulus and item in a particular block should get the same non-zero positive integer in its bgr field (i.e., everything in block one should get a number like 1). This should present everything in a particular block in the order in which it is listed in the .que file, but randomize the order of the blocks presented to a particular participant.

[syzergy]

You should be able to accomplish this by first listing all stimuli and items within a block in the order you want them to appear in the .que file. Do this for all four blocks of ten stimuli and the 5 items corresponding to each stimulus.

Then, every stimulus and item in a particular block should get the same non-zero positive integer in its bgr field (i.e., everything in block one should get a number like 1). This should present everything in a particular block in the order in which it is listed in the .que file, but randomize the order of the blocks presented to a particular participant.

Thank you, this is a great solution for randomizing the blocks.
Is there also a way to randomize the presentation order of the 10 stimuli within each block?

[jason_reed]

Within each block, assign all of the items you want to randomize the same nonzero positive integer in the wgr field. Items with the same number in the wgr field will be randomized when running that .que file. Use different nonzero positive integers to randomize different sets of items.