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This Article Full Text Full Text (PDF) All Versions of this Article: 99/2/695    most recent 00529.2007v1 Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Naito, E. Articles by Ehrsson, H. H. Search for Related Content PubMed PubMed Citation Articles by Naito, E. Articles by Ehrsson, H. H.

Human Superior Parietal Lobule Is Involved in Somatic Perception of Bimanual Interaction With an External Object

¹National Institute of Information and Communication Technology, Research Department 1, Kobe Advanced ICT Research Center, Biophysical ICT Group and ²ATR Computational Neuroscience Laboratories, Kyoto, Japan; ³Division of Human Brain Research, Department of Neuroscience, Karolinska Institute, Stockholm, Sweden; ⁴Institute of Medicine, Research Center Jülich and Brain Imaging Center West, Jülich, Germany; ⁵C. and O. Vogt Institute for Brain Research, University of Düsseldorf, Dusseldorf, Germany; ⁶Department of Psychiatry and Psychotherapy, Aachen University Hospital, Aachen, Germany; and ⁷MR-Research Center, Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden

Submitted 11 May 2007; accepted in final form 7 November 2007

The question of how the brain represents the spatial relationship between the own body and external objects is fundamental. Here we investigate the neural correlates of the somatic perception of bimanual interaction with an external object. A novel bodily illusion was used in conjunction with functional magnetic resonance imaging (fMRI). During fMRI scanning, seven blindfolded right-handed participants held a cylinder between the palms of the two hands while the tendon of the right wrist extensor muscle was vibrated. This elicited a kinesthetic illusion that the right hand was flexing and that the hand-held cylinder was shrinking from the right side. As controls, we vibrated the skin surface over the nearby bone beside the tendon or vibrated the tendon when the hands were not holding the object. Neither control condition elicited this illusion. The significance of the illusion was also confirmed in supplementary experiments outside the scanner on another 16 participants. The "bimanual shrinking-object illusion" activated anterior parts of the superior parietal lobule (SPL) bilaterally. This region has never been activated in previous studies on unimanual hand or hand-object illusion. The illusion also activated left-hemispheric brain structures including area 2 and inferior parietal lobule, an area related to illusory unimanual hand-object interaction between a vibrated hand and a touched object in our previous study. The anterior SPL seems to be involved in the somatic perception of bimanual interaction with an external object probably by computing the spatial relationship between the two hands and a hand-held object.

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