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Pure left hemianacousia: clinical and neurophysiological study
A Donnet1, G Farnarier, A Schmitt
1Service de Neurochirurgie, CHU Timone, Marseille, France.
Clinical EEG (Electroencephalography)
|April 1, 1993
Summary
This study presents a case of pure left hemianacousia, a hearing deficit. Findings show reduced auditory evoked potential amplitudes, linked to a right temporal hematoma.
Area of Science:
- Neuroscience
- Audiology
- Neurology
Background:
- Hemianacousia is a rare auditory processing disorder characterized by unilateral hearing loss.
- It is typically diagnosed through audiological tests like the dichotic listening test and electrophysiological measures.
Observation:
- A case of pure left hemianacousia is presented.
- Late auditory evoked potentials (LAEPs), middle-latency auditory evoked potentials (MLAEPs), and P300 were recorded.
- A significant reduction in the left hemisphere's N90 wave amplitude was observed over the right hemisphere.
Findings:
- The patient exhibited pure left hemianacousia, a unilateral hearing impairment.
- Electrophysiological recordings revealed asymmetry in auditory processing.
- A CT scan identified a right temporal hematoma potentially correlating with auditory cortex area 41.
Implications:
- This case highlights the link between structural brain lesions and specific auditory deficits.
- It underscores the utility of auditory evoked potentials in diagnosing sensory hearing loss.
- Understanding such cases can inform neuro-audiological rehabilitation strategies.