+x

 

z5020905 - 5/25/2020

Hi All,

I'd like the images in the Dot Probe Task Template (Images) to be presented in random order. The script says "all 80 trials are randomly sampled without replacement". Does anyone know what this means? If this doesn't mean the images are presented randomly, does anyone know how to edit this script to present the images in random order?

Thank you in advance,
Hannah

+x

 

Dave - 5/25/2020

+x

 

z5020905 - 5/25/2020

Hi All,

I'd like the images in the Dot Probe Task Template (Images) to be presented in random order. The script says "all 80 trials are randomly sampled without replacement". Does anyone know what this means? If this doesn't mean the images are presented randomly, does anyone know how to edit this script to present the images in random order?

Thank you in advance,
Hannah

The images within each category are selected randomly (without replacement). See <list Category1Target_itemnumbers> etc. and the accompanying comments.

There are two trial types in the script -- category 1 and category 2. Those are sampled randomly in equal proportions. That is with

<block ImageDotProbeTask>
/ onblockbegin = [
    values.task = 2;
]
/ trials = [
    1 = getReady;
    2-81 = noreplace(Category1, Category2);
]
</block>

you get 40 category 1 trials and 40 category 2 trials in random order.