Instructions

  1. Create a new experiment
  2. Create a new block: “Consent”
  3. Add 1 stimulus set (type paragraph) to the Consent block
  4. Upload the “Consent” stimulus set (found on the right)
  5. Add a “Next Trial button” to the Consent block
  6. Create a new block: “Instructions”
  7. Add 1 stimulus set (type paragraph) to the Instructions block
  8. Upload the “Instructions” stimulus set (found on the right)
  9. Add a “Next Trial button” to the Instructions block
  10. Create a new block: “Trials”
  11. Add 1 stimulus set (type image) to the Trials
  12. Upload the “Trials” stimulus set (found on the right)
  13. Go to block options
  14. Select Random (with repeats)
  15. Go to the layout tab
  16. Select “Preserve original size”
  17. Go to the timeline tab
  18. Modify the time on the timepoint card to 1500ms
  19. Create 2 new timepoints
  20. Modify the time on your new timepoints to 0ms and 3000ms
  21. Go to the layout tab
  22. Go to the 0ms timepoint
  23. Add a new stimulus set (text) to the container
  24. Upload the “Fixation cross” stimulus set (found on the right)
  25. Go to the 3000ms timepoint
  26. Set the layout to 2a
  27. Add a new stimulus set (image) to container 1
  28. Upload the “Green button” stimulus set (found on the right)
  29. Add a new stimulus set (image) to container 2
  30. Upload the “Red button” stimulus set (found on the right)
  31. Disable scaling for containers 1 & 2
  32. Go to the timepoint tab
  33. Set the RT Timer to 3000 ms
  34. Set the ignore input toggle to ON for timepoint 0ms and 1500ms
  35. Create a new block: “End”
  36. Add 1 stimulus set (type text) to the End block
  37. Upload the “End” stimulus set (found on the right)
  38. Try out the Stroop Test you’ve just created!

Files

Chapters

0:00 Intro

0:12 Stroop Test explained

1:19 Add Consent & Instructions blocks

2:09 Add main block

2:27 Configure stimuli

2:41 Add timepoints

3:05 Modify timepoint layouts

4:15 Final touches for the main block

4:35 End block

4:58 Testing

Script

Intro

Welcome to Experimaker Classics. In this video, we’ll be creating a stroop test from scratch – in under 10 minutes.

Stroop Test explained

In the stroop test, the stimuli are color words, such as RED and GREEN. The words are printed with the same color – such as the word red colored red – or a different color – such as the word red colored green. Participants must pay attention to the color – and not the word. It turns out this can be difficult!

Let’s look at the final product. First, there’s a consent form, followed by instructions. The main trials consist of a fixation cross at 0ms, stimulus presentation at 1500ms, and clickable response buttons at 3000ms. Finally, an end screen. Let’s begin!

Add Consent & Instructions blocks

Add a block for the consent form. Upload the consent text. And add a next trial button. Similarly, add an instructions block

Add main block

For our main block, we’ll add the stimuli first.

Configure stimuli

We want each stimulus to appear twice. And we’ll disable scaling. Perfect!

Add timepoints

Next, we’ll add separate timepoints for the fixation cross and input buttons. We want the fixation cross to appear at 0ms. The stimuli at 1500ms. And the input buttons at 3000 ms.

Modify timepoint layouts

Let’s go to the layout tab to add the fixation cross and buttons. Upload the fixation cross to the 0ms timepoint. The 1500 ms timepoint is correctly configured. So, at the 3000 ms timepoint we’ll set layout 2a, with the green button on the left hand side, and the red button on the right hand side. And disable scaling. Let’s test our design. Perfect!

Final touches for the main block

We want our reaction timer to start from 3000ms, the moment when participants are able to respond. And disable input for the 1st and 2nd timepoints

End block

Finally, we’ll add the end screen

Testing

And let’s test the completed experiment!