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Three hands: fragmentation of human bodily awareness |
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| Authors: | Riitta Hari,Ritva Hä nninen,Timo Mä kinen,Veikko Jousmä ki,Nina Forss,Mika Seppä ,Oili Salonen |
| Affiliation: | a Brain Research Unit, Low Temperature Laboratory, Helsinki University of Technology, P.O. Box 2200, FIN-02015 HUT, Espoo, Finland b Department of Neurology, Central Hospital of Central Finland, Keskussairaalantie 19, FIN-40620 Jyväskylä, Finland c Department of Clinical Neurosciences, Helsinki University Central Hospital, FIN-00290 Helsinki, Finland d Department of Radiology, Helsinki University Central Hospital, FIN-00290 Helsinki, Finland |
| Abstract: | We describe patient E.P. who occasionally perceives a ‘ghost' hand which copies the previous positions of the left hand with a 0.5–1 min time lag, but follows the movement patterns of the right hand. The symptoms started after an operation of a ruptured aneurysm, followed by an infarction of the right frontal lobe; E.P. also has a previously lesioned corpus callosum. Neuromagnetic recordings revealed that activity of the left secondary somatosensory cortex was strongly suppressed during the ghost arm percept, thereby providing an objective correlate for E.P.'s sensations. We conclude that simultaneous mental contents about body scheme may be based on neural information extracted at considerably different times, resulting in fragmentation of bodily awareness. |
| Keywords: | Body image Bodily awareness Anterior supplementary motor area Corpus callosum Secondary somatosensory cortex Magnetoencephalography |
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