How might "The Fall of the House of Usher" be read as a journey into the human mind?

The house of Usher, both in terms of the Usher family and the house it self were confused by the passersby as "one and the same". This was because, as you read, the story shows that the family had a history of disease, death, entrapment, insanity.  This is a compilation of the scariest demons that humans have to deal with from time to time. In Usher's case, Roderick and his family were all representatives of such demons, of such imperfections. The house decayed as Roderik decayed, and both the house and the owner were going downhill. Finally, when the narrator escapes, the house implodes on its own. Similarly with Roderick and humans dealing with their inner torments, they are also bound to implode and destroy themselves. (And those around them can help, just as much as they don't fall right with them)