I think it was a TED talk by Derek Sivers that got people quoting this all over the internet, about how if you tell people your goals then you get some kind of dopamine hit just by feeling like the kind of person who has those goals and this reduces your motivation to actually achieve the goals. Sivers himself seems to have regretted how his talk was interpreted and posted this semi-retraction: https://sivers.org/zipit2
But identity-based goal or not, the conclusion that you make yourself less likely to achieve a goal by telling people about it defies common sense. I mean, here’s the peer-reviewed science saying my common sense is wrong – http://www.psych.nyu.edu/gollwitzer/09_Gollwitzer_Sheeran_Seifert_Michalski_When_Intentions_.pdf – but this is a psychology paper from 2009 so I’m willing to bet real money on common sense, despite seeing no obvious flaw with the paper.
Any psychology researchers in the audience want to weigh in on this? Anyone want to wager money on whether the study will replicate?
PS: Ha, apparently I made this point 4.5 years ago: keep your goals to yourself, except beemindable goals