I think it was Blue Peter. If not, it was Newsround or similar, maybe?
I'm really trying to find this video clip for a work thing. I'm sure i didn't imagine it, but I can't find anywhere. It's from the very early 80s, I think.
The scenario: A group of 10 teens were asked to count drum beats. There were 12 beats in total.
9 kids were in on the experiment. When asked, the first 9 kids said they'd counted 13 beats. When it came to the last kid, they also said 13.
Does anyone remember and/or have any clues how can find it?