I have a 6 year old daughter who has been taking lessons with the 3rd graders this past year. I just had a conference with her teachers and they are ok to jump her a grade. They thought two grades would have been too much socially. But they did agree to give her advanced lessons. She is in a Montessori where grades 1-3 are together. I really believe all children have the potential for genius. Its all in how they are…
Links: https://www.gwern.net/Replication#pygmalion-effect My opinionated summary of Rosenthal's oeuvre: https://www.goodreads.com/review/show/1798638457
We see the same thing for growth mindset, BTW, if you compare the original studies which made it famous with the most recent rigorous large-scale studies (and then extrapolate out the usual decline effect in long-term followups).