Yes. There's a good article on this from a few years back that began to popularize a term for this, called the "Decline Effect": http://www.newyorker.com/magazi

Yes. There's a good article on this from a few years back that began to popularize a term for this, called the "Decline Effect": http://www.newyorker.com/magazine/2010/12/13/the-truth-wears-off http://www.newyorker.com/magazine/2010/12/13/the-truth-wears... (oblig.: author is disgraced science journalist Jonah Lehrer, but this is one of his pieces that has stood up to all scrutiny). The most straightforward explanation, mentioned in the article and in some of the /r/science thread comments, is that null results are much harder to publish than positive results. This is not limited to the field of psychology. All that said, I'm really excited by this paper and by the gradually increasing interest in this problem.