Er, no offense, haifagirl, but I never heard of this. Now, having access to all the major biomedical libraries, I could run a search.
Or—
I am highly allergic to a number of substances. After reading your post, I did the empirical experiment. I held several substances, some of which I am allergic to–some of which I am not.
With my eyes closed.
In every single case, I was able to resist the push.
I do not know where this comes from, but there is certainly empirical evidence against it.