[open] experiment structure help!!!

garybegood

Hi,
I have a little problem with my experiment. I want to show to my subjects 90 sequences each of three images. These sequences of stimuli are already randomized by me. I have to create 90 different sequences???
I have tried to insert three variables shown in the loop for 90 times. I have identified cell in the table variables with the name of an image that I have previously loaded in the catalog, but it does not work. If I start the experiment will always show me the same sequence with the same three images for 90 times.
What should I do?

Help me please!

lvanderlinden

Hi,

Welcome to the forum!

The order of the items in a sequence is always fixed (i.e., the items are run in sequence), even if you set the loop item, that is wrapped around it, to random.

For more information about sequences and loops, please see:

• http://osdoc.cogsci.nl/usage/about-sequences-and-loops/

  Tricks to randomise the order in which the items within a sequence are run anyway, are described in these previous threads:

• http://forum.cogsci.nl/index.php?p=/discussion/354/solved-eliminating-a-sequence/p1

• http://forum.cogsci.nl/index.php?p=/discussion/144/solved-randomizing-a-sequence-of-four-blocks/p1

Does this help? If you have problems to apply those hints to your situation, please let us know!

Best,

Lotje