title: On the neural basis of sensory weighting: Alpha, beta and gamma modulations during complex movements.
abstract: Previous studies have revealed that visual and somatosensory information is processed as a function of its relevance during movement execution. We thus performed spectral decompositions of ongoing neural activities within the somatosensory and visual areas while human participants performed a complex visuomotor task. In this task, participants followed the outline of irregular polygons with a pen-controlled cursor. At unpredictable times, the motion of the cursor deviated 120° with respect to the actual pen position creating an incongruence between visual and somatosensory inputs, thus increasing the importance of visual feedback to control the movement as suggested in previous studies. We found that alpha and beta power significantly decreased in the visual cortex during sensory incongruence when compared to unperturbed conditions. This result is in line with an increased gain of visual inputs during sensory incongruence. In parallel, we also found a simultaneous decrease of gamma and beta power in sensorimotor areas which has not been reported previously. The gamma desynchronization suggests a reduced integration of somatosensory inputs for controlling movements with sensory incongruence while beta ERD could be more specifically linked to sensorimotor adaptation processes.
authors.affiliation: Aix Marseille Univ, CNRS, LNC, FR3C 3512, Marseille, France.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Lebar
authors.affiliation: Aix Marseille Univ, CNRS, LNC, FR3C 3512, Marseille, France.
authors.forename: Jérémy
authors.initials: J
authors.lastname: Danna
authors.affiliation: Aix Marseille Univ, CNRS, LNC, FR3C 3512, Marseille, France.
authors.forename: Simon
authors.initials: S
authors.lastname: Moré
authors.affiliation: Aix Marseille Univ, CNRS, LNC, FR3C 3512, Marseille, France.
authors.forename: Laurence
authors.initials: L
authors.lastname: Mouchnino
authors.affiliation: Aix Marseille Univ, CNRS, LNC, FR3C 3512, Marseille, France. Electronic address: jean.blouin@univ-amu.fr.
authors.forename: Jean
authors.initials: J
authors.lastname: Blouin
mesh_terms: D000328:Adult; D004569:Electroencephalography; D056228:Feedback, Sensory / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D009068:Movement / Q000502:physiology; D011597:Psychomotor Performance / Q000502:physiology*; D013003:Somatosensory Cortex / Q000502:physiology*; D014793:Visual Cortex / Q000502:physiology*; D055815:Young Adult
keywords: Arm movement; Electroencephalography; Event-related desynchronization; Proprioception; Sensory conflict; Vision