After combing through movie lists from IMDB to Reddit, I think I've created the most complete collection of horror movies that climb inside your skull and mess with your brains.
'Beginner's Guide: Psychological Horror' -- http://tinyurl.com/j2ygg5w
'What Exactly Is a "Psychological" Horror Film?' -- http://tinyurl.com/jlp59ue
'Why We Crave Horror Movies' by Stephen King -- http://tinyurl.com/pm5amx5
'Common Themes in Psychological Thrillers' -- http://tinyurl.com/hqgtwu5
'Psychological Horror in the Films of David Lynch' -- http://tinyurl.com/glgmpym