Eh, in psychology the default is "nothing ever happens ever". No one ever changes, no effect lasts, and nothing ever replicates. There are all sorts of "intuitive" results which utterly fail to replicate, so I'd be surprised if things are better when you can't do a real study even in principle. I suppose I might just be jaded from the replication crisis, but my expectation is that things mostly just kind of happen. It's why I left for the gentle shores of math, where things work exactly as much as any pure math can be said to work.