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Landau-Kleffner syndrome: epileptic activity in the auditory cortex
R Paetau1, M Kajola, M Korkman
1Low Temperature Laboratory, Helsinki University of Technology, Espoo, Finland.
Neuroreport
|April 1, 1991
Summary
Landau-Kleffner syndrome (LKS) involves EEG spikes and verbal auditory agnosia. This study found LKS spikes originate near the left auditory cortex, disrupting sound processing.
Area of Science:
- Neuroscience
- Clinical Neurology
- Pediatric Neurology
Background:
- Landau-Kleffner syndrome (LKS) presents with acquired epileptic aphasia and electroencephalographic (EEG) abnormalities.
- Understanding the precise neuroanatomical origin of LKS-associated spikes is crucial for diagnosis and treatment.
Observation:
- Magnetoencephalography (MEG) was used to localize spike sources in an LKS patient.
- Spike origins were correlated with detailed magnetic resonance imaging (MRI) of the brain.
- Evoked auditory responses were analyzed in relation to spike activity.
Findings:
- All recorded LKS spikes localized to the vicinity of the left auditory cortex.
- Spike activity in the left auditory cortex interfered with evoked responses.
- Suppression of auditory responses in the right hemisphere correlated with spike activity and resolved upon spike disappearance.
Implications:
- Unilateral discharges near the auditory cortex may explain the verbal auditory agnosia in LKS.
- These findings suggest a mechanism involving disrupted auditory processing and interhemispheric suppression in LKS.
- This research aids in understanding the pathophysiology of Landau-Kleffner syndrome.