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OSWeb - Collecting keyboard response while presenting multiple sketchpads

Hi all!

I am programming an experiment where I am trying to combine the AB and the PRP paradigms in OSWeb. In doing so, speeded responses are required to the first target stimulus (T1). Therefore, I need to collect a keyboard response (either the left arrow or the right arrow key) within the time period starting from the onset of T1 until the end of the trial.

I would use a coroutine item to implement this if I were going to run this experiment locally -In fact, I did to illustrate what I'm trying to achieve, see attached.- However, it seems it doesn't work in OSWeb. Though, mentioned here in this thread that coroutines are supported as of OSWeb 1.3.8. (Oops, I revealed the secret!). I also checked this thread out, but I didn't quite get it.

Could anyone help me implement this in OSWeb?

Many thanks in advance!

Bugay



Comments

  • edited October 28

    Oh, the links above don't work. So, here they are.

    This is the one where @Daniel mentioned that coroutines are supported as of OSWeb 1.3.8:

    And this is the second one:

    Bugay


  • Hi @bugay,

    What I can quickly see is that you have entered LEFT;RIGHT in the correct response field, which is not allowed. You can only enter one character here (for instance by using a variable), or leave it empty and specify the correct response in a correct_response column in your loop table.

    Also, Osweb is sometimes a bit more picky how you specify things. I see that you now specified all responses in uppercase characters (e.g. `LEFT;RIGHT`) while osweb may only work with lowercase (`left;right`). Maybe you can try if that works, and if it does, then it is a bug in osweb, as it should accept the same inputs as OpenSesame. If so, can you report it at osweb's issue tracker at https://github.com/open-cogsci/osweb?

    Buy Me A Coffee

  • Dear @Daniel,

    Thanks for the prompt reply. I made the changes you mentioned, but it is still the same. However I noticed something very interesting.

    I use a white background, and present stimuli in black. When I run the experiment in OSWeb, as the trial_coroutine starts the screen suddenly goes black, and then it goes back to normal (white) by the end of the coroutines. When I tried switching the color of the stimuli in the trial_coroutine to white, I noticed that it actually displays the stimuli, but on a black background. And this is why it seems they are not being displayed at all. Is there a way to overcome this issue?

    Bugay


  • Hi @Bugay,

    I've run your experiment on both osweb and OpenSesame and I can see the discrepancy. Very strange indeed. It appears as if the coroutines item resets the background color to black somehow and doesn't honor the general settings. I have also managed to reproduce it in a simple test experiment:

    Since this happens only in osweb and not in OpenSesame it is clearly a bug in osweb.

    I currently don't have the time to dive into the code and find the cause. I have created an entry on osweb's issue tracker to keep it on our radar though: https://github.com/open-cogsci/osweb/issues/42. Check back there for the status on this bug and its fix.

    I can't really think of a possible workaround. The only one I could come up with was setting the background color explicitly on each sketchpad, but that is also ignored.

    Sorry for currently not being of anymore help.

    Buy Me A Coffee

  • Thank you!

    I'll be checking the link.

    Bugay


  • Hey guys! Bugay and I were wondering if you can provide a (rough) indication of when the co-routines issues might be solved / a new update of OSweb for Mac will be available. Keep up the great work!

    Mark

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