Bihemispheric foundations for human speech comprehension

Emerging evidence from neuroimaging and neuropsychology suggests that human speech comprehension engages two types of neurocognitive processes: a distributed bilateral system underpinning general perceptual and cognitive processing, viewed as neurobiologically primary, and a more specialized left he...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 2010-10, Vol.107 (40), p.17439-17444
Main Authors: Bozic, Mirjana, Tyler, Lorraine K., Ives, David T., Randall, Billi, Marslen-Wilson, William D.
Format: Article
Language:English
Subjects:
Animals
Biological Sciences
Brain Mapping
Cognition & reasoning
Comprehension
Comprehension - physiology
Humans
Language
Language comprehension
Linguistics
Magnetic resonance imaging
Medical imaging
Neurobiology
Neuropsychology
Past tense
Speech
Speech Perception - physiology
Temporal lobe
Verbal Behavior - physiology
Words
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Summary:Emerging evidence from neuroimaging and neuropsychology suggests that human speech comprehension engages two types of neurocognitive processes: a distributed bilateral system underpinning general perceptual and cognitive processing, viewed as neurobiologically primary, and a more specialized left hemisphere system supporting key grammatical language functions, likely to be specific to humans. To test these hypotheses directly we covaried increases in the nonlinguistic complexity of spoken words [presence or absence of an embedded stem, e.g., claim (clay)] with variations in their linguistic complexity (presence of inflectional affixes, e.g., play+ed). Nonlinguistic complexity, generated by the on-line competition between the full word and its onset-embedded stem, was found to activate both right and left fronto-temporal brain regions, including bilateral BA45 and -47. Linguistic complexity activated left-lateralized inferior frontal areas only, primarily in BA45. This contrast reflects a differentiation between the functional roles of a bilateral system, which supports the basic mapping from sound to lexical meaning, and a language-specific left-lateralized system that supports core decompositional and combinatorial processes invoked by linguistically complex inputs. These differences can be related to the neurobiological foundations of human language and underline the importance of bihemispheric systems in supporting the dynamic processing and interpretation of spoken inputs.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.1000531107