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State of data

Dear All!

Please, someone tell me what could be the reason that the JATOS server (even on MINDPROBE) does not record data, that is, it is in the "DATA_RETRIEVED" state, but the data is "none" after closing the experiment window. This happens even for the Simon task which was downloaded without changes from the lab.js Builder and exported for JATOS (see image).

Thank you very much in advance,

Marko Maliković


  • Hi,

    DATA_RETRIEVED generally means that the participant opened the study but closed the window before sending any data back to JATOS. So it's not an error. You can check that this happens if you try to run your own task either until the end, or closing the browser window before any trial data are sent (depending on your code, this might be after each trial or after a number of trials).

    Hope this helps


  • krikri
    edited November 2023

    In addition to Elisa, I'd suggest to try out one of JATOS own example studies to rule out lab.js does something weird in the end of the study.



  • Dear elisa and kri,

    I don't know if you understood me but this happens to me with studies made by the lab.js team as (as they say): "Pre-made, ready-to-run studies". According to your answers, I can only conclude that the problem is in their studies. I will ask on their forum. Thanks anyway! Marko

  • Hi Marko,

    Yes, we understood you :)

    What we mean is that this is not an error. Your studies (probably) work well. It's just that people closed the browser before finishing the study.

  • Dear Elisa,

    It's not that. This is not an attempt by the respondent. I am trying this because I was suspicious. I get to the end of the experiment and only at the end close the window and the data is still "none". I also know that this is not an error, but I don't understand why it doesn't record my movement through the experiment.


  • Here is what I tried again: At I uploaded the Simon task via Builder, I exported it for Jatos, I uploaded it to Mindprobe, I enabled "General Multiple" access, downloaded the Study link, started it and went through the experiment to the end, to the window where it says "You can now close this window.". And again there is "none" data in the results.

  • Ah I see now, sorry.

    Can you check the console (if you enable developer tools). Are there any warnings or errors?

  • Dear Elisa,

    It is not necessary. The end of the experiment is not defined in lab.js, so it is never exited. Now I fixed it and now everything works ok.

    Thanks again for your help,


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