I wouldn't go by research off hand. Psychological research is more of a sham every day and often driven by money or politics. The best example was the "new disorder" called "Intermittent Explosive Disorder" said to affect up to 16 million Americans. Basically the made a disorder out of road rage when people lose their tempers.
"The findings show the little-studied disorder is much more common than previously thought, said lead author Ronald Kessler, a health care policy professor at Harvard Medical School."
Of course they have "medication" for this
"People think it’s bad behavior and that you just need an attitude adjustment, but what they don’t know ... is that there’s a biology and cognitive science to this,” said Dr. Emil Coccaro, chairman of psychiatry at the University of Chicago’s medical school."
http://www.msnbc.msn.com/id/13152708/
When they say there is a "biology" to this, they also mean there is a pill for it - and they would like very much to get us all on it. Drug companies pay most universities to do these studies if you didn't know (the Gov will pay too sometimes - and the people who work for them are from the schools and drug companies as well - its like musical chairs) .
Politically their is a "new atheism" movement in psychology where they want to make a disorder out of religious beliefs and also conservative politics. They also focus on "disgust" a lot and say that disgust people can feel for things are really not based on reason but on culturally based emotions - which btw they can correct if they can get to kids young enough (and brainwash them their way basically). Scince is starting to be abused not unlike eugenics was in the 40's so be very careful about any "studies" you read about these days.
Remember the polar bears it was said were dying? Tuned out 4 had died in a massive storm. But the 'scientists" figured that for the 4 bodies they found there must have been another 36 they didn't so their reports and "'studies" said "up to" 40 bears died. So they basically invent statistics based on what they call "finger prints of evidence" or evidence that isn't their but might be imagined as existing. It's crazy.
Not that a person couldn't see angels and devil and not be psychotic - it happens all the time. Also - hypnotically speaking concentration is a function of hypnosis and if people really want to see something they can. People even fall in love with people they see one way and in reality are another (and very thin gals can see "fat" in the mirror).