"In most instances, depression should not be thought of as a disorder 
at all. ... depression is in fact an adaptation, a state of mind 
which brings real costs, but also brings real benefits."

<http://www.scientificamerican.com/article.cfm?id=depressions-evolutionary>http://www.scientificamerican.com/article.cfm?id=depressions-evolutionary 


abstract: 
<http://psycnet.apa.org/index.cfm?fa=search.displayRecord&uid=2009-10379-009>http://psycnet.apa.org/index.cfm?fa=search.displayRecord&uid=2009-10379-009 



"People Who experience mood swings, fear, voices and visions"