title: Boosted activation of right inferior frontoparietal network: a basis for illusory movement awareness.
abstract: The feeling of illusory movement is considered important in the study of human behavior because it is deeply related to motor consciousness. However, the neural basis underlying the illusion of movement remains to be understood. Following optimal vibratory stimulation of muscle tendon, certain subjects experience illusory movements while others do not. In the present fMRI study, we sought to uncover the neural basis of illusory movement awareness by contrasting a posteriori these two types of subjects. Examining fMRI data using leave-one-subject-out general linear models and region of interest analyses, we found that a non-limb-specific associative network, including the opercular part of the right inferior frontal gyrus and the right inferior parietal lobule, was more active in subjects with illusions. On the other hand, levels of activation in other brain areas involved in kinaesthetic processing were rather similar between the two subsamples of subjects. These results suggest that activation of the right inferior frontoparietal areas, once passed a certain threshold, forms the basis of illusory movements. This is consistent with the global neuronal workspace hypothesis that associates conscious processing with surges of frontoparietal activity.
authors.affiliation: Aix-Marseille Université, CNRS, LNC UMR, 7291, Marseille, France; Aix-Marseille Université, CNRS, FR, 3512, Marseille, France.
authors.forename: Fabien
authors.initials: F
authors.lastname: Cignetti
authors.forename: Marianne
authors.initials: M
authors.lastname: Vaugoyeau
authors.forename: Bruno
authors.initials: B
authors.lastname: Nazarian
authors.forename: Muriel
authors.initials: M
authors.lastname: Roth
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Anton
authors.forename: Christine
authors.initials: C
authors.lastname: Assaiante
mesh_terms: D000328:Adult; D000344:Afferent Pathways / Q000098:blood supply / Q000502:physiology; D001364:Awareness / Q000502:physiology*; D005260:Female; D005625:Frontal Lobe / Q000098:blood supply / Q000502:physiology*; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D007088:Illusions / Q000502:physiology*; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008297:Male; D009068:Movement / Q000502:physiology*; D018482:Muscle, Skeletal / Q000294:innervation; D009415:Nerve Net; D010100:Oxygen / Q000097:blood; D010296:Parietal Lobe / Q000098:blood supply / Q000502:physiology*; D013997:Time Factors; D014732:Vibration
chemical_list: D010100:Oxygen
keywords: consciousness; fMRI; illusory movements; kinaesthesia; leave one subject out procedure