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Cereb Cortex. 2015 Jul;25(7):1867-77. doi: 10.1093/cercor/bht428. Epub 2014 Jan 22.

Evidence for Cerebellar Contributions to Adaptive Plasticity in Speech Perception.

Author information

1
Center for Neuroscience at the University of Pittsburgh, Pittsburgh, PA, USA Center for the Neural Basis of Cognition, Pittsburgh, PA, USA Current address: Department of Cognitive, Linguistic, and Psychological Sciences, Brown University, Providence, RI, USA.
2
Center for Neuroscience at the University of Pittsburgh, Pittsburgh, PA, USA Center for the Neural Basis of Cognition, Pittsburgh, PA, USA Department of Psychology, Carnegie Mellon University, Pittsburgh, PA, USA.
3
Center for Neuroscience at the University of Pittsburgh, Pittsburgh, PA, USA Center for the Neural Basis of Cognition, Pittsburgh, PA, USA Current address: Brain Corporation, San Diego, CA, USA.
4
Center for the Neural Basis of Cognition, Pittsburgh, PA, USA Department of Psychology, Carnegie Mellon University, Pittsburgh, PA, USA.
5
Center for Neuroscience at the University of Pittsburgh, Pittsburgh, PA, USA Center for the Neural Basis of Cognition, Pittsburgh, PA, USA Department of Psychology, University of Pittsburgh, Pittsburgh, PA, USA.

Abstract

Human speech perception rapidly adapts to maintain comprehension under adverse listening conditions. For example, with exposure listeners can adapt to heavily accented speech produced by a non-native speaker. Outside the domain of speech perception, adaptive changes in sensory and motor processing have been attributed to cerebellar functions. The present functional magnetic resonance imaging study investigates whether adaptation in speech perception also involves the cerebellum. Acoustic stimuli were distorted using a vocoding plus spectral-shift manipulation and presented in a word recognition task. Regions in the cerebellum that showed differences before versus after adaptation were identified, and the relationship between activity during adaptation and subsequent behavioral improvements was examined. These analyses implicated the right Crus I region of the cerebellum in adaptive changes in speech perception. A functional correlation analysis with the right Crus I as a seed region probed for cerebral cortical regions with covarying hemodynamic responses during the adaptation period. The results provided evidence of a functional network between the cerebellum and language-related regions in the temporal and parietal lobes of the cerebral cortex. Consistent with known cerebellar contributions to sensorimotor adaptation, cerebro-cerebellar interactions may support supervised learning mechanisms that rely on sensory prediction error signals in speech perception.

KEYWORDS:

adaptation; cerebellum; fMRI; perceptual learning; supervised learning

PMID:
24451660
PMCID:
PMC4481605
DOI:
10.1093/cercor/bht428
[Indexed for MEDLINE]
Free PMC Article

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