NINE normal volunteers performed a “theory of mind'task while their regional brain blood
flow pattern was recorded using the PET [" O] HO technique. Control conditions induced
subjects to attend to the visual and semantic attributes of known objects. In a third condition,
subjects had to infer the function of an unfamiliar object from its form. In the “theory of
mind'condition, subjects had to infer function based on the form of both familiar and
unfamiliar objects and in addition, model the knowledge and rationality of another mind …