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[Palilalia due to thalamic infarctions]

J L Casado Chocán1, J M López Domínguez, A Gil-Peralta

  • 1Sección de Neurología, Hospital Juan Ramón Jiménez, Huelva.

Neurologia (Barcelona, Spain)
|April 1, 1995
PubMed
Summary

Palilalia, a speech disorder, can occur after bilateral thalamic infarcts. This case suggests supplementary motor area involvement may cause this condition.

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Area of Science:

  • Neurology
  • Neuroscience
  • Speech Pathology

Background:

  • Palilalia is a speech disorder characterized by involuntary repetition of words or phrases.
  • The exact neurological underpinnings of palilalia are not fully understood.
  • Thalamic lesions are rarely associated with speech disturbances.

Observation:

  • A 45-year-old woman presented with isolated palilalia.
  • Neurological examination revealed no other focal deficits.
  • Neuroimaging showed bilateral thalamic infarcts on MRI and CT scans.

Findings:

  • Single-photon emission computed tomography (SPECT) revealed bilateral frontoparietal hypoactivity.
  • The findings suggest a potential link between thalamic lesions and speech dysfunction.
  • Diaschisis, a condition of secondary functional depression, affecting the supplementary motor area is hypothesized.

Implications:

  • Bilateral thalamic lesions can lead to palilalia through diaschisis affecting motor speech areas.
  • This case expands the known spectrum of neurological deficits associated with thalamic infarcts.
  • Further research is warranted to explore the role of thalamocortical pathways in speech production.

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