The neural correlates of desire...

Kawabata and Zeki show that categorizing any stimulus according to its desirability activates three different brain areas: the superior orbito-frontal, the mid-cingulate, and the anterior cingulate cortices. The article has the usual pretty fMRI pictures. (Now - if we could just get a fix on the areas active in desire's satiation and avoid all the fuss of real life by just stimulating them directly!)