title: Experience-dependent modulation of feedback integration during singing: role of the right anterior insula.
abstract: Somatosensation plays an important role in the motor control of vocal functions, yet its neural correlate and relation to vocal learning is not well understood. We used fMRI in 17 trained singers and 12 nonsingers to study the effects of vocal-fold anesthesia on the vocal-motor singing network as a function of singing expertise. Tasks required participants to sing musical target intervals under normal conditions and after anesthesia. At the behavioral level, anesthesia altered pitch accuracy in both groups, but singers were less affected than nonsingers, indicating an experience-dependent effect of the intervention. At the neural level, this difference was accompanied by distinct patterns of decreased activation in singers (cortical and subcortical sensory and motor areas) and nonsingers (subcortical motor areas only) respectively, suggesting that anesthesia affected the higher-level voluntary (explicit) motor and sensorimotor integration network more in experienced singers, and the lower-level (implicit) subcortical motor loops in nonsingers. The right anterior insular cortex (AIC) was identified as the principal area dissociating the effect of expertise as a function of anesthesia by three separate sources of evidence. First, it responded differently to anesthesia in singers (decreased activation) and nonsingers (increased activation). Second, functional connectivity between AIC and bilateral A1, M1, and S1 was reduced in singers but augmented in nonsingers. Third, increased BOLD activity in right AIC in singers was correlated with larger pitch deviation under anesthesia. We conclude that the right AIC and sensory-motor areas play a role in experience-dependent modulation of feedback integration for vocal motor control during singing.
authors.affiliation: McGill University-Montreal Neurological Institute, Neuropsychology and Cognitive Neuroscience, Montreal, QC H3A 2B4, Canada. boris.kleber@uni-tuebingen.de
authors.forename: Boris
authors.initials: B
authors.lastname: Kleber
authors.forename: Anthony G
authors.initials: AG
authors.lastname: Zeitouni
authors.forename: Anders
authors.initials: A
authors.lastname: Friberg
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Zatorre
mesh_terms: D000328:Adult; D000779:Anesthetics, Local / Q000494:pharmacology; D001676:Biofeedback, Psychology / Q000502:physiology*; D001931:Brain Mapping; D002540:Cerebral Cortex / Q000098:blood supply / Q000502:physiology*; D005246:Feedback; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008012:Lidocaine / Q000494:pharmacology; D008279:Magnetic Resonance Imaging; D008297:Male; D009146:Music; D010100:Oxygen; D010898:Pitch Perception / Q000502:physiology; D012044:Regression Analysis; D063346:Singing / Q000502:physiology*; D013997:Time Factors; D014827:Vocal Cords / Q000187:drug effects / Q000502:physiology
chemical_list: D000779:Anesthetics, Local; D008012:Lidocaine; D010100:Oxygen
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