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Multi-model mapping of phonemic fluency.

Lisa Cipolotti1,2, Tianbo Xu2, Bronson Harry3

  • 1Department of Neuropsychology, National Hospital for Neurology and Neurosurgery, London WC1N 3BG, UK.

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|October 25, 2021
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Summary
This summary is machine-generated.

This study reveals that left frontal brain damage significantly impairs phonemic fluency, a measure of word generation. Specific left frontal regions, subcortical areas, and associated white matter tracts are crucial for this executive function.

Keywords:
executive functionsfluencyfocal lesionfrontal lobeslesion-symptom mapping

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Phonemic fluency, assessing voluntary non-overlearned response generation, is a key frontal lobe task.
  • Its underlying neural mechanisms and anatomical correlates remain incompletely understood and debated.
  • Previous studies faced limitations like small sample sizes and insufficient lesion analysis.

Purpose of the Study:

  • To investigate the neuroanatomical basis of phonemic fluency using advanced lesion-symptom mapping techniques.
  • To identify specific brain regions and white matter tracts critical for word generation.
  • To elucidate the network involved in executive functions related to phonemic fluency.

Main Methods:

  • Studied a large cohort of patients with focal unilateral frontal, posterior, or subcortical lesions (n=275).
  • Utilized magnetic resonance imaging (MRI) and computed tomography (CT) for lesion localization.
  • Employed parcel-based lesion-symptom mapping, tract-wise analysis, and Bayesian multivariate modeling.

Main Results:

  • Left frontal lesions caused greater phonemic fluency impairment than right frontal or posterior lesions.
  • Subcortical lesions also significantly impacted overall performance compared to posterior lesions.
  • Worse fluency correlated with damage to specific left frontal gyri, the anterior cingulate gyrus, and the caudate nucleus.
  • Disconnections within left frontal tracts were identified as critical, implicating left middle, inferior, and dorsomedial frontal regions.

Conclusions:

  • Phonemic fluency relies on a left-lateralized network involving specific frontal areas, subcortical structures, and white matter tracts.
  • A proposed model suggests medial frontal regions support 'energization' and lateral frontal regions support 'selection' in word generation.
  • The advanced methodologies provide robust insights into the neurocognitive architecture of executive functions.