4.6 Article

Manual praxis and language-production networks, and their links to handedness

期刊

CORTEX
卷 140, 期 -, 页码 110-127

出版社

ELSEVIER MASSON, CORP OFF
DOI: 10.1016/j.cortex.2021.03.022

关键词

Tool use gestures; Verbal fluency; Hand dominance; Interrelations; Functional asymmetries; Lateralization; Segregation; Dissociation

资金

  1. National Science Centre [2011/02/A/HS6/00174]
  2. Ministry of Science and Higher Education [6168/IA/128/2012]
  3. European Regional Development Fund as part of the Innovative Economy Operational Programme, 20072013
  4. [Maestro 2011/02/A/HS6/00174]

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The study found that atypical organization of praxis was present in all handedness groups, and was about two and a half times as common as atypical organization of language. Despite strong associations of praxis and language, dissociations of atypically represented praxis from typical left-lateralized language were common, while the inverse dissociations were very rare.
While Liepmann was one of the first researchers to consider a relationship between skilled manual actions (praxis) and language for tasks performed freely from memory, his primary focus was on the relations between the organization of praxis and left-hemisphere dominance. Subsequent attempts to apply his apraxia model to all cases he studied - including his first patient, a non-pure right-hander treated as an exception - left the praxis-handedness issue unresolved. Modern neuropsychological and recent neuroimaging evidence either showed closer associations of praxis and language, than between handedness and any of these two functions, or focused on their dissociations. Yet, presentday developments in neuroimaging and statistics allow us to overcome the limitations of the earlier work on praxis-language-handedness links, and to better quantify their interrelationships. Using functional magnetic resonance imaging (fMRI), we studied tool use pantomimes and subvocal word generation in 125 participants, including righthanders (N-RH = 52), ambidextrous individuals (mixedhanders; N-MH = 31), and lefthanders (N-LH = 42). Laterality indices were calculated both in two critical cytoarchitectonic maps, and 180 multi-modal parcellations of the human cerebral cortex, using voxel count and signal intensity, and the most relevant regions of interest and their networks were further analyzed. We found that atypical organization of praxis was present in all handedness groups (RH = 25.0%, MH = 22.6%; LH = 45.2%), and was about two and a half times as common as atypical organization of language (RH = 3.8%; MH = 6.5%; LH = 26.2%), contingent on ROI selection/LI-calculation method. Despite strong associations of praxis and language, regardless of handedness and typicality, dissociations of atypically represented praxis from typical left-lateralized language were common (similar to 20% of cases), whereas the inverse dissociations of atypically represented language from typical left-lateralized praxis were very rare (in similar to 2.5% of all cases). The consequences of the existence of such different phenotypes for theoretical accounts of manual praxis, and its links to language and handedness are modeled and discussed. (C) 2021 The Author(s). Published by Elsevier Ltd.

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