Video tutorials
Narrated walkthroughs of Open Lab and of building tasks in the lab.js builder. Each has subtitles in 12 languages, chapters and a transcript, the files to follow along directly under the player, and a link to its docs page.
Files for this video
- ↓ scoring.jsonThe builder file this video starts from (the end of the previous video).
- ↓ instructions.jsonThe builder file at the end of this video. The next video starts from it.
The lab.js builder: a reaction-time task, step by step
Instructions and a thank-you screen
3:45 · narrated, with subtitles in 12 languages · recorded in November 2026
Two screens of text for the reaction-time task, written in HTML: instructions before the trials and a thank-you screen after them, with a response on the space bar, and why the last screen of a task has to end on Open Lab.