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Mental representations underlying awareness of one's body, termed "body schema," are dynamically updated regarding the position of the limbs and torso. To investigate how such representations may be generated, researchers used functional magnetic resonance imaging (fMRI) to study a patient with an intermittent supernumerary phantom-limb illusion.
More than 3 years before this study, the patient had had a subarachnoid hemorrhage caused by an aneurysm of the left pericallosal artery. During subsequent surgery, small regions of the right cingulate gyrus and anterior corpus callosum had been resected. Postoperatively, a small infarction of the mesial right superior frontal gyrus had also been noted. Since surgery, the patient has reported the fr…