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Midbrain deafness with normal brainstem auditory evoked potentials.

E Vitte1, F Tankéré, I Bernat

  • 1ENT Department, Hôpital Pitié-Salpêtrière, Paris, France. elizabeth.vitte@psl.ap-hp-hop-paris.fr

Neurology
|March 27, 2002
PubMed
Summary
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Bilateral lesions in the inferior colliculi can cause pure word deafness, a condition affecting language comprehension. This occurs even when brainstem auditory-evoked potentials (BAEP) remain normal, highlighting specific auditory pathway involvement.

Area of Science:

  • Neuroscience
  • Audiology
  • Neurology

Background:

  • Pure word deafness is a rare condition characterized by the inability to comprehend spoken language while other auditory functions remain intact.
  • The precise neuroanatomical correlates of pure word deafness are not fully understood, with various brain regions implicated in previous case studies.

Observation:

  • Two patients presented with acquired pure word deafness following distinct neurological events: one after head trauma and the other after arteriovenous malformation embolization.
  • Magnetic Resonance Imaging (MRI) revealed bilateral lesions specifically affecting the inferior colliculi in both patients.

Findings:

  • The presence of bilateral inferior colliculi lesions correlated with the manifestation of pure word deafness.
  • Despite significant lesions in the inferior colliculi, brainstem auditory-evoked potentials (BAEP) were within normal limits in both cases.

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Implications:

  • These findings suggest that the inferior colliculi play a critical role in auditory language processing, specifically in word comprehension.
  • The dissociation between pure word deafness and normal BAEP in these cases indicates that the inferior colliculi are essential for higher-level auditory processing beyond basic auditory pathway integrity.