I have an experiment I made with Builder that runs well, but I need to be able to randomize two sets of image stimuli separately for each trial. I have read many of the previous posts on this subject and followed a tutorial online. I wrote some code but you will see below I am getting error messages…

Note: what look like check boxes in the code are [ then closed ] brackets following posters = and faces =. Not sure what happened there. - pjw

Have a look at my online demos for Independent Randomisation and also Trial Switching for a method of loading trials in a code component. [image] PsychoPy Online Demos Blog If you have routines or experiments that are likely to be useful to others, please create a post in…

Thank you Wakecarter! That totally worked. It was indeed independent randomization of two columns I needed (each ColA stimulus appears only once followed by a randomly selected stimulus from colB). FYI- I used only your code in loadA routine and within the trial loop. I didn’t use your code_JS in…

Hi Wakecarter - one more question My experiment works well locally. When I try it on pavlovia I get an error message as it tries to bring up the first image: when setting the image of ImageStim: Posterpic the argument: images/AINeu.jpg is neither an image nor a video” } Any thoughts?

Nevermind Wakecarter! I found your post from Nov 23 solving this problem by changing thisA=listA.pop() to thisA=listA.pop()[0] Thank you again!

I note that adding that [0] makes the program work online but makes it crash locally. One final question if I may: I assume your line thisExp.addData(‘thisA’,thisA) is what has the program write to the data file the name of the stimulus from col A that was presented on that trial. I added another l…

I see only now, that even though that second command doesn’t seem to work, the data file contains a column with the colB stimuli written out as presented

Adding code to Builder for the first time to accomplish randomization of stimuli

Builder

wakecarter March 21, 2024, 10:33am 3

Have a look at my online demos for Independent Randomisation and also Trial Switching for a method of loading trials in a code component.

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Adding code to Builder for the first time to accomplish randomization of stimuli

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