title: The mirror illusion induces high gamma oscillations in the absence of movement.
abstract: We tested whether mirror visual feedback (MVF) from a moving hand induced high gamma oscillation (HGO) response in the hemisphere contralateral to the mirror and ipsilateral to the self-paced movement. MEG was recorded in 14 subjects under three conditions: bilateral synchronous movements of both index fingers (BILATERAL), movements of the right hand index finger while observing the immobile left index finger (NOMIRROR), and movements of the right hand index finger while observing its mirror reflection (MIRROR). The right hemispheric spatiospectral regions of interests (ROIs) in the sensor space, sensitive to bilateral movements, were found by statistical comparison of the BILATERAL spectral responses to baseline. For these ROIs, the post-movement HGO responses were compared between the MIRROR and NOMIRROR conditions. We found that MVF from the moving hand, similarly to the real movements of the opposite hand, induced HGOs (55-85Hz) in the sensorimotor cortex. This MVF effect was frequency-specific and did not spread to oscillations in other frequency bands. This is the first study demonstrating movement-related HGO induced by MVF from the moving hand in the absence of proprioceptive feedback signaling. Our findings support the hypothesis that MVF can trigger the feedback-based control processes specifically associated with perception of one's own movements.
authors.affiliation: The MEG Centre, Moscow State University of Psychology and Education, Moscow, Russian Federation; Wellcome Trust Centre for Neuroimaging, UCL Institute of Neurology, London WC1N 3BG, UK.
authors.forename: A
authors.initials: A
authors.lastname: Butorina
authors.affiliation: The MEG Centre, Moscow State University of Psychology and Education, Moscow, Russian Federation; Psychological Institute of the Russian Academy of Education, Laboratory of Developmental Behavioural Genetics, Moscow, Russian Federation. Electronic address: vpf_child@mail.ru.
authors.forename: A
authors.initials: A
authors.lastname: Prokofyev
authors.affiliation: Department of Neurorehabilitation and Physical Therapy, Research Center of Neurology, Moscow, Russian Federation; Centre for Cognition & Decision Making, Faculty of Psychology, Higher School of Economics, Moscow, Russian Federation.
authors.forename: M
authors.initials: M
authors.lastname: Nazarova
authors.affiliation: Wellcome Trust Centre for Neuroimaging, UCL Institute of Neurology, London WC1N 3BG, UK.
authors.forename: V
authors.initials: V
authors.lastname: Litvak
authors.affiliation: The MEG Centre, Moscow State University of Psychology and Education, Moscow, Russian Federation; Psychological Institute of the Russian Academy of Education, Laboratory of Developmental Behavioural Genetics, Moscow, Russian Federation.
authors.forename: T
authors.initials: T
authors.lastname: Stroganova
mesh_terms: D000328:Adult; D001921:Brain / Q000502:physiology*; D001931:Brain Mapping; D005074:Evoked Potentials, Visual / Q000502:physiology*; D005260:Female; D007839:Functional Laterality / Q000502:physiology; D065818:Gamma Rhythm / Q000502:physiology*; D006225:Hand / Q000502:physiology; D006801:Humans; D015225:Magnetoencephalography; D008297:Male; D009068:Movement / Q000502:physiology; D009903:Optical Illusions / Q000502:physiology*; D055815:Young Adult
keywords: Hand movements; High gamma somatotopy; MEG; Mirror visual feedback; Sensorimotor cortex