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Subcortical Aphasia: An Update.

Victor Nascimento Almeida1, Marcia Radanovic2

  • 1Laboratorio de Neurociencias (LIM-27), Faculdade de Medicina, Departamento e Instituto de Psiquiatria, Hospital das Clínicas HCFMUSP, Universidade de São Paulo, Rua Dr. Ovídio Pires de Campos, 785, São Paulo, SP, 05403-903, Brazil.

Current Neurology and Neuroscience Reports
|September 11, 2024
PubMed
Summary
This summary is machine-generated.

Subcortical structures like the basal ganglia and thalamus play a key role in aphasia, even without cortical lesions. Connectivity studies reveal white matter pathways are crucial for language processing and recovery.

Keywords:
Basal gangliaConnectivity studiesNeuroimagingSubcortical aphasiaThalamusTractography

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Area of Science:

  • Neuroscience
  • Neurolinguistics
  • Cognitive Science

Background:

  • Aphasia is typically associated with cortical lesions.
  • The precise role of subcortical structures in aphasia remains debated.
  • Conventional neuroimaging often overlooks subcortical contributions.

Purpose of the Study:

  • To re-evaluate theories on basal ganglia and thalamus involvement in aphasia.
  • To explore subcortical roles in aphasia without apparent cortical damage.
  • To integrate new findings from advanced neuroimaging and language processing concepts.

Main Methods:

  • Review of leading theories on subcortical roles in aphasia.
  • Analysis of modern neuroimaging techniques, including functional MRI and tractography.
  • Examination of connectivity studies focusing on white matter pathways.

Main Results:

  • Connectivity studies highlight the importance of the arcuate fasciculus (AF), inferior frontal occipital fasciculus (IFOF), and uncinate fasciculus (UF) in aphasia.
  • Evidence suggests the thalamus modulates frontal cortex activity in lexical-semantic processing.
  • Progress is being made in understanding the balance between direct linguistic processing and domain-general functions of subcortical structures.

Conclusions:

  • Subcortical structures, particularly the basal ganglia and thalamus, are implicated in aphasia genesis.
  • White matter pathway integrity, especially the AF, IFOF, and UF, is critical for language function.
  • Future research should continue to leverage advanced neuroimaging to elucidate subcortical contributions to language and aphasia.