Stanford University

Stanford Language and Cognition Lab

Welcome! Please consider participating in this study only if you are a native spaker of English. Make sure your audio is enabled and the volume is up. Watch the video below and type the word you heard in the text area below the video.

Note: you won't be able to preview this HIT before accepting it because it's so short.

For all the videos in this study, please make sure you watch the FULL video and only click "Next" when the video has stopped. Otherwise the software will exclude your data.

Watch the instruction video below. Click START to begin the study.

Was Raffie right?


What is your age?

What is your gender identity?

Have you ever learned about logical conjunction (&) and disjunction (V) as part of a course or reading on math, logic, or programming ?

What is your native language?

What in your opinion was the goal of the experiment?

If you have any comment about the experiment, please write it here. Did you happen to run into any issues?

Thank you for participating in the study. The purpose of the study is to understand how children learn the meaning of the logical word "or". In this study, we ask participants to judge whether statements with "or" were right or wrong depending on what happened in the story. If you would like to know more about this topic or if you have any questions or concerns, please don't hesitate to contact the lead researcher at