 What would top-down theorists say about the same examples? I believe that people want to harm me, and as a result I perceive them as looking at me malevolently; or I believe that someone looking almost identical to my sister has replaced her, and as a result the person claiming to be my sister doesn’t look to me as my sister does. The top-down thesis about delusion formation has been proposed especially for monothematic delusions such as Capgras (Campbell 2001; Eilan 2000) and for delusions of passivity, when people report that there are external influences on their thoughts and actions (Sass 1994; Graham and Stephens 1994; Stephens and Graham 2000).