I found this scientific review paper on the role of essential fatty acids in brain membrane function and in the genesis of psychiatric disease. The full text version was available by EBSCO (at least our university in Jyvaskyla provides EBSCO service, probably many others, too):
Haag, M. (2003). Essential Fatty Acids and the Brain. Can J Psychiatry, 48(3), 195 - 203.
Not much NEW for those who have read dr. Sears books, but it reads well and is suitable reading for sceptical minds. :P