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Presenting sets with random number of stimuli in random order

edited April 2016 in OpenSesame

Hello to all,

I need some help. I am trying to build an experiment in which 5 sets of pictures will be presented in a very fast pace (0.3 second each picture). Thing is, I want the order of the pictures to be random and the order of the sets to be random as well. In addition, the sets are to be created from 2 different categories, each set with a random number of stimuli from each category (for instance, 8 from A 10 from B, 6 from A 5 from B, etc.), although the number cannot be too small (say min 4). Does anyone have an idea how to do this?

Thanks in advanced
Amihai

Comments

  • edited 8:15AM

    Any help?

    I have done some progress and have another question: Is there a way to run less cycles than the variable levels in a loop? meaning the loop will choose randomly from the levels.
    I tried putting [a variable] in the cycles number but got an error.

  • edited April 2016

    Hi Amihai,

    Have you already solved the randomization problem?

    Is there a way to run less cycles than the variable levels in a loop?

    Yes! In the loop item there is an advanced options checkbox. If you enable it, you can set a value for a break if field. In this field, you can add variable names.

    Does this make sense?

    Eduard

    Buy Me A Coffee

  • edited 8:15AM

    Dear Eduard,

    I solved part of the randomization problem using loop functions.
    I was thinking to use the "less cycles than the variable levels in a loop" solution to randomize the number of stimuli from each category (although not an elegant solution..).
    Do you know how could I use the Break if check box to do this?

    And thanks for your help.

    Amihai

  • edited 8:15AM

    Hi Amihai,

    you could use a counter variable and break the loop (with the break_if field), once the variable has a certain value. So, if you have a loop that supposed to have 15 trials, you add an inline_script to your trial_sequence, in which you increment the variable by one (counter += 1).

    Does something like that work for you?

    Good luck,

    Eduard

    btw. sorry for the late reply!

    Buy Me A Coffee

  • edited 8:15AM

    Dear Eduard (or anyone else who can help),

    Thank you very much for your replay. I used your tip and eventually managed to find a plausible solution. Yet, now I have another problem: I need to log the pictures that were eventually presented in the loop from the total number of possible pictures. The output file does not give me this information. Is there a way to do this?

    Thanks you
    Amihai

  • edited 8:15AM

    Hi Amihai,

    All exp.variables are automatically logged by the log item, so all you have to do is to store the picture names in a few variables.

    Say you have a picture list as follows: pictures = ['1.jpg','2.jpg','3.jpg'], shuffled with random.shuffle(pictures). Now you can log them as follows:

     exp.pic1 = pictures[0]
     exp.pic2 = pictures[1]
     exp.pic3 = pictures[2]
    

    Hope this hepls.

    Cheers,

    Josh

  • edited 8:15AM

    Hi Josh,

    First of all, thank you.
    Secondly, I did not understand your answer. I am using a loop function to randomly show the pictures from a variable list with the pictures names. I have two categories of pictures so to randomly show a different proportion from each category I used the "less cycles than the variable levels in a loop" option (see above). How can I know which pictures were eventually shown?

    Amihai

  • edited 8:15AM

    Still no luck.
    doed any one have an idea how to solve this?

  • edited 8:15AM

    Hi Amihai,

    What I suggested requires the use of an inline_script item. You can place that thing somewhere in your trial sequence. I also assume that your pictures have names, right? (e.g. '1.jpg'). As soon as the picture for your trial is specified, you can log it.

    Cheers,

    Josh

  • edited 8:15AM

    Hi Josh,

    I am using the sketchpad to display the images from the loop function.
    This is the text from the sketchpad script:

    set duration "[duration]"
    set description "Displays stimuli"
    draw image center=1 file="[words]" scale=1 show_if=always x=0 y=0 z_index=0

    How can i log the image from this?

    And thank you very much for your help

    Amihai

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