title: Reliability of Visual and Somatosensory Feedback in Skilled Movement: The Role of the Cerebellum.
abstract: The integration of vision and somatosensation is required to allow for accurate motor behavior. While both sensory systems contribute to an understanding of the state of the body through continuous updating and estimation, how the brain processes unreliable sensory information remains to be fully understood in the context of complex action. Using functional brain imaging, we sought to understand the role of the cerebellum in weighting visual and somatosensory feedback by selectively reducing the reliability of each sense individually during a tool use task. We broadly hypothesized upregulated activation of the sensorimotor and cerebellar areas during movement with reduced visual reliability, and upregulated activation of occipital brain areas during movement with reduced somatosensory reliability. As specifically compared to reduced somatosensory reliability, we expected greater activations of ipsilateral sensorimotor cerebellum for intact visual and somatosensory reliability. Further, we expected that ipsilateral posterior cognitive cerebellum would be affected with reduced visual reliability. We observed that reduced visual reliability results in a trend towards the relative consolidation of sensorimotor activation and an expansion of cerebellar activation. In contrast, reduced somatosensory reliability was characterized by the absence of cerebellar activations and a trend towards the increase of right frontal, left parietofrontal activation, and temporo-occipital areas. Our findings highlight the role of the cerebellum for specific aspects of skillful motor performance. This has relevance to understanding basic aspects of brain functions underlying sensorimotor integration, and provides a greater understanding of cerebellar function in tool use motor control.
authors: Department of Kinesiology, East Carolina University, Greenville, NC, 27858, USA.|Cognitive Motor Control Laboratory, School of Applied Physiology, Georgia Institute of Technology, 555 14th St., Atlanta, GA, 30332-0356, USA.
authors: J C
authors: JC
authors: Mizelle
authors: Department of Psychology & Neuroscience, Duke University, Box 90086, 417 Chapel Drive, Durham, NC, 27708, USA.
authors: Alexis
authors: A
authors: Oparah
authors: Cognitive Motor Control Laboratory, School of Applied Physiology, Georgia Institute of Technology, 555 14th St., Atlanta, GA, 30332-0356, USA. Lewis.wheaton@ap.gatech.edu.
authors: Lewis A
authors: LA
authors: Wheaton
mesh_terms: D000328:Adult; D001931:Brain Mapping; D002531:Cerebellum / Q000098:blood supply / Q000502:physiology*; D016000:Cluster Analysis; D056228:Feedback, Sensory / Q000502:physiology*; D005260:Female; D007839:Functional Laterality / Q000502:physiology; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008297:Male; D009048:Motor Skills / Q000502:physiology*; D009068:Movement / Q000502:physiology*; D010100:Oxygen / Q000097:blood; D010775:Photic Stimulation; D010812:Physical Stimulation; D015203:Reproducibility of Results; D055815:Young Adult
chemical_list: D010100:Oxygen
keywords: Motor control; Sensory reliability; Somatosensation; Vision; fMRI