title: The balance of feelings: vestibular modulation of bodily sensations.
abstract: The vestibular system processes information about head movement and orientation. No unimodal vestibular cortex has been identified in the mammalian brain. Rather, vestibular inputs are combined with many other sensory signals in the cortex. This arrangement suggests that vestibular input could influence processing in other sensory modalities. Here we show that vestibular stimulation differentially modulates two submodalities of the somatosensory system, increasing sensitivity to tactile input, and independently reducing sensitivity to nociceptive input. These modulations of touch and pain can clearly be distinguished from supramodal attentional effects of vestibular stimulation, because they are bilateral and operate in different directions. Outside the artificial conditions of laboratory stimulation, the vestibular system codes movements of the head, indicating a new relation between the body and the external world. We suggest the vestibular system participates in a form of sensory signal management, changing the balance between the various sensory systems as the relation between the body and the external environment changes. This sensory rebalancing may be a crucial element in the brain's capacity to reorient towards novel or salient features in the environment.
authors.affiliation: Institute of Cognitive Neuroscience, University College London, London, UK.
authors.forename: Elisa R
authors.initials: ER
authors.lastname: Ferrè
authors.forename: Gabriella
authors.initials: G
authors.lastname: Bottini
authors.forename: Gian Domenico
authors.initials: GD
authors.lastname: Iannetti
authors.forename: Patrick
authors.initials: P
authors.lastname: Haggard
mesh_terms: D000328:Adult; D005260:Female; D019416:Head Movements / Q000502:physiology; D006801:Humans; D008297:Male; D009068:Movement / Q000502:physiology*; D009949:Orientation / Q000502:physiology; D017288:Pain Threshold / Q000502:physiology*; D011434:Proprioception / Q000502:physiology; D012684:Sensory Thresholds / Q000502:physiology; D055698:Touch Perception / Q000502:physiology*; D014722:Vestibule, Labyrinth / Q000502:physiology*