For concept tests, you can now choose whether participants can watch a video multiple times or only once.

To turn it on, click the video concept in your question and check "Can watch at most once."

Real ads get one shot. Until now, respondents could rewind and rewatch, so their answers might reflect a second or third look. 

When your ad is live, your audience sees it once. Now you hear what they took away from one view during testing.