Change the stimulus list
Edit arrays such as val, ch1, ch2, or correct_choice. Keep related lists the same length.
Temporary browser sandbox
Edit a task, swap images, and test your own version.
This playground runs entirely in your browser. Your changes are temporary: they affect only this page on your computer and do not change the official tutorial site.
Temporary task playground
Use this when the tutorial asks you to modify a task. Nothing is saved to the official site.
1. Edit the task file
Load a task, edit its HTML, then run it in the preview.
Loading the selected task…
2. Preview your version
The task below uses your edited HTML and any temporary images you upload.
3. Add temporary images
Upload images here when you want the edited task to use images that are not already in the tutorial folders. These images exist only in this browser tab.
Example: upload im999.png into the Object 2AFC folder, then use 999 in the task's image list.
Remember: temporary uploads and edits are not saved after you close or refresh this page. Download your edited HTML if you want to keep it.
Common edits students can try
These edits are meant for exploration during the tutorial.
Change presentation time
Find values like trial_duration: 100 and try a longer or shorter duration.
Swap stimuli
Upload a new image named like im999.png, then include 999 in the relevant image list.
Change task wording
Edit the welcome or instruction text and test how it changes the participant experience.