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
- ↓ one-trial.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
One trial: fixation, circle, key press
3:23 · narrated, with subtitles in 12 languages · recorded in October 2026
The first trial of a reaction-time task in the lab.js builder: a fixation cross, a blue circle answered with F or J, a pause, then the preview and the data it records.