Credits: (Iillustration) Graphic by Bryan Christie Design. Stimulating the Brain by Mark S. George. Scientific American, September 2003, page 69; (Brain photo) Tractographic analysis of historical lesion surgery for depression. Schoene-Bake JC, Parpaley Y, Weber B, Panksepp J, Hurwitz TA, Coenen VA. Neuropsychopharmacology. 2010 December; 35(13): 2553-2563.