Item stack

Lorraine

Hi,

I wrote an experiment a few weeks ago. It could run. But recently, the experiment cannot run anymore (no warning, just freeze, so I have to abort the experiment). The detail said:

I use Mac, and after I updated the software, the problem is still there. Could you please maybe let me know what should I do?

eduard

Hi Lorraine,

that sounds like a bug. Could you try to reproduce the error? Like building an experiment that is as simple as possible, but still shows this unwanted behaviour? Then could you share the experiment here?

Oh, and you updated to Opensesame 3.3.6?

Thanks,

Eduard

Lorraine

Hi, Eduard,

Yes, I am using the latest version.

I also try to run an old experiment and it worked. So, probably it is something related to my code. Could you maybe help me check it?

To blink or not blink.osexp

eduard

Hi Lorraine,

The code runs fine on my machine (Ubuntu 18, with Opensesame 3.3.6), so it probably really is a bug related to the Mac version of Opensesame. Have you tried it with all backends or only with legacy?

In this case, I would indeed report it as a bug on the github page, unless @Daniel or @sebastiaan are already aware of this problem?

Eduard

sebastiaan

Hi @Lorraine ,

The experiment looks fine to me. The error message indicates that you were able to abort the experiment by pressing Escape and then Q, which means that it didn't really freeze (otherwise this wouldn't have been possible either). Could you describe in a bit more detail what exactly happens?

— Sebastiaan

Lorraine

Hi, Sebastiaan and Eduad,

Thank you very much. It works on my computer now, somehow...

Now, I have a new problem. I would like to add some buttons as a multiple choice response. However, I wish the text on the button could be changed based on the previous variable. Is that possible to define that in the form base plugin or use python under opensesame environment? If no, could you please recommend me how to make that work?

Best,

Lorraine

lvanderlinden

Hi @Lorraine,

Because the text on the buttons is defined online, you will need to create the content of the display in the Run phase of your experiment.

I see two options:

1. You could use a feedback item (instead of a form_base item) to create the buttons, followed by a mouse_response item to collect the click. (For the difference between feedback items and sketchpad items, see: https://osdoc.cogsci.nl/3.3/manual/stimuli/visual/)
2. Alternatively, you could create your form using Python inline scripting and place your code in the Run-phase tab of the inline_script item. For more information, see: https://osdoc.cogsci.nl/3.2/manual/forms/custom/#creating-forms-using-python-inline-script

For more information on OpenSesame's Prepare-Run, see this article:

• https://osdoc.cogsci.nl/3.2/manual/prepare-run/

I hope this helps. If you want more specific advise, please try to describe the behaviour you want to achieve as precisely as possible.

Cheers,

Lotje

Lorraine

Hi

Yes, I have tried to draw buttons using the python inline script (your second suggestion). However, I am still lost how to add dynamic text on the button in this way.

In my experiment, I randomly selected two letter stimuli from 8 letters. In the response page, there are 4 buttons. One button displays the two stimuli, while three buttons display unrelated letters. Irrelevant letters are also selected from those 8 letters. The button displaying the correct letters is also randomly selected.

Also, I wonder how the response could be recorded in this process?

Thank you for your help!

Best,

Lorraine

lvanderlinden

Hi @Lorraine

I made an example script for what I think you are trying to achieve (see comments for explanation). Does that help?

6761.osexp

Cheers,

Lotje

Lorraine

Hi, Lotje,

Thank you very much for your code! It helps a lot.

I changed a little bit to fit my experiment.

It is weird that sometimes this code works, sometimes it reports an error as you can see above. In the trial that works, the irrelevant_pair can be printed, whereas when it reports an error, it cannot print the pair.

It is really confusing. Thank you for your help. Hope to hear from you soon.

eduard

Hi Lorraine,

Can you try to print var.irrelevant_pair before assigning it to var.text1 - var.text6? I would be surprised if this assignment would work when irrelevant pair doesn't have as many items as you have var.text variables (so 6). You can also share your experiment if you wish.

Eduard

Lorraine

To blink or not blink.osexp

Hi,

It's got the same error when printing it beforehand. So I uploaded the experiment.

Best,

Lanting

eduard

The problem is that your construction with if's and elif's does not cover all possibilities of target letters. So, if none of the 4 cases occurs (so, T1 is not S or D, and T2 is not F and G), then var.irrelevant_pairs, will only have one item. Then, when you try to assign it to the six values, you get that error. So what you need to do is to make sure that var.irrelevant_pair will always have six items before you assign its values to the six text variables, probably by manipulating your if-elif-else structure to cover all possibilities.

Fyi, changing the order of the print statement and that assignment won't prevent the error message, but it does print out the value of var.irrelevant_pair, in all cases, so that you can see in which cases the error occurs. For example, in my case it occurred when the var.T1 = 'F'.

Hope this clears things up.

Eduard