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[open] Trial list, pre-loading and efficiency

edited February 2013 in OpenSesame

Hello again,

I'm using an extremely short trial list atm with text, made in the variable wizard.
the text is on the heading of "14 euro now" and "20 euro in 2 weeks".
when I go from 4 to 8 trials I see an increase in load.

at the moment the variable t_text is declared in the (only) loop, and on thus on every loop a new item is picked from the list. but I have the feeling that I shouldn't do this with 200 trial-texts. Is there a way to pre-load a trial list to negate the delay?


  • edited 10:37PM


    This sounds like a delay discounting task! If that is the case: why not simply put the fixed parts of the text in a sketchpad and vary only the values? E.g.: "[nowvalue] euro now or [delayvalue] in [delaytime] days"

    I've created a DDT before and used this technique. I had five delays (all values in days), a fixed delayvalue and calculated the current value per trial (as a random number between two boundaries defined based on a user's behaviour), therefore there was no need to create extremely long lists. Could this be a solution in your case as well? If you are using this paradigm, I could upload some sample code.

    If not: why do you worry about the delay? At the trial's start, the trial is prepared. Therefore you should have a minimal delay per trial. Although typing 200 rows sounds like quite a big bother, though.

    Good luck!

  • edited February 2013

    That is exactly what I'm trying to do.
    Using variables to fill in the blanks is a very nice and neat way, thx!

    If you upload the bit's that would help get around any snag.

    But my question was due to a weird delay in the sketchpad, using "keypress" as the time. using the fire-button, space-bar or mouse1 often doesnt give a response, while in the demo it works like a charm

    Update: using the spacebar followed by the trigger seems to satisfy the sketchpad, so for now I'll leave it at that

  • edited 10:37PM


    You can find my delay discounting task here. There is a notepad item added (called readme) that tells you which article I've followed. The experiment should be the same as the one mentioned in the article.

    It may not be the prettiest bit of work and it certainly is not my best work, but it still works.

    Good luck!

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