You can, for example, find tons of studies about so-called 'attention window' or 'working memory span', but they didn't even mention that those characteristics could be dramatically reduced under stress or any other state of overload.
http://scholar.google.com/scholar?q=working+memory+under+str...
Yes, you could call his Interpretation of dreams a hack, but he developed and extended a more general theory of mental dynamics, which, ironically, was known for aeons in the East.
Which, by the way, is all scientifically unsubstantiated bullshit until you show me some properly documented and controlled experiments demonstrating otherwise.