Where is a Nose with Respect to a Foot? The Left Posterior Parietal Cortex Processes Spatial Relationships among Body Parts

Neuropsychological studies suggest that patients with left parietal lesions may show impaired localization of parts of either their own or the examiner's body, despite preserved ability to identify isolated body parts. This deficit, called autotopagnosia, may result from damage to the Body Stru...

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Bibliographic Details
Published in:Cerebral cortex (New York, N.Y. 1991) N.Y. 1991), 2008-12, Vol.18 (12), p.2879-2890
Main Authors: Corradi-Dell'Acqua, Corrado, Hesse, Maike D., Rumiati, Raffaella I., Fink, Gereon R.
Format: Article
Language:English
Subjects:
Adult
autotopagnosia
body schema
body structural description
Brain Mapping
Cerebral Cortex - physiology
Electric Stimulation
extrastriate body area
Female
Foot - anatomy & histology
Head - anatomy & histology
Humans
intraparietal sulcus
Magnetic Resonance Imaging
Male
Motor Cortex - physiology
Nose - anatomy & histology
Parietal Lobe - physiology
Photography
Posture
Somatosensory Cortex - physiology
Space Perception
Young Adult
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Summary:Neuropsychological studies suggest that patients with left parietal lesions may show impaired localization of parts of either their own or the examiner's body, despite preserved ability to identify isolated body parts. This deficit, called autotopagnosia, may result from damage to the Body Structural Description (BSD), a representation which codes spatial relationships among body parts. We used functional magnetic resonance imaging to identify the neural mechanisms underlying the BSD. Two human body or building parts (factor: STIMULI) were shown to participants who either identified them or evaluated their distance (factor: TASK). The analysis of the interaction between STIMULI and TASK, which isolates the neural mechanism underlying BSD, revealed an activation of left posterior intraparietal sulcus (IPS) when the distance between body parts was evaluated. The results show that the left IPS processes specifically the information about spatial relationships among body parts and thereby suggest that damage to this area may underlie autotopagnosia.
ISSN:1047-3211
1460-2199
DOI:10.1093/cercor/bhn046