Stroop specifications

lavinne
New Member

Posts: 4

Stroop specifications May 14, 2021 20:24:57 GMT

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Post by lavinne on May 14, 2021 20:24:57 GMT

Hi there,
I'm working with the already created stroop task script and trying to modify. Basically I need to create 30 trials (23 incongruent, 7 congruent) for a practice trial, and 256 trials (with 192 incongruent and 64 congruent) across three different REAL trials. Is there a way to specify how many incongruent and congruent trials per block yet still have them mixed together and in random order? I also need to put the multiple blocks into one script (practice, block 1, block 2, and block 3). As you can see I'm new to Psytoolkit and am grateful for its functionality. Started to go through coding tutorials, etc., but wanted to see if there were any quick suggestions here.

Thanks,
Lisa

matia
Very experienced

Posts: 77

Stroop specifications May 15, 2021 13:16:11 GMT

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Post by matia on May 15, 2021 13:16:11 GMT

Hello,

ofcourse, there are different ways of doing this. First is using table (you'll have 4 rows [1 congruent and 3 incongruent] and youll define a task. When defining a block you can put block REAL - tasklist - task REAL 64 [and it will cycle 64 times between each table row, leading to the ratio of 192 incon ti 64 congruent]. If not stated explicitly (fixed; all_before_repeat; no_repeat) the tablerows are randomly selected. So, to conclude, you should have a table consisting of unique rows. If I've understood you correctly, you have 2 conditions (CON vs INCON) and you would like to keep a ratio of 25% for CON. For this to work, four rows are enough since you can define how many trials to have in the block command.

Another way of doing it is by using arrays function. You just have to think it through and define what should happen with a pre-defined array.

Hope this helps, best of luck,
Matia

The best time to plan an experiment is after you've done it.

student
New Member

Posts: 2

Stroop specifications Feb 6, 2023 10:21:01 GMT

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Post by student on Feb 6, 2023 10:21:01 GMT

Hello,
I designed a Stroop test consisting of 100 trials. I realized that I could not create blocks because I am a beginner, and as a result, I created a version of the demo on the website with 100 trials. I assumed that it would generate 100 trials in random order from 16 possibilities. So I thought it would consist of 25 congruent and 75 incongruent words. But when I checked, I noticed that each participant responded to the congruent and incongruent words at a different rate. For example, one participant answered 25 and the other 27 or 23 matching words. There was no unexpected situation in the reaction times of the participants. I calculate the Stroop effect by subtracting the average response time of correct answers from the participants to the incongruent words from the average of the response times of the correct answers to the congruent words. However, in this case, can I use the scores obtained from this measurement?
I would be very grateful if you could share your experience.
Thanks.