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Published on: December 18, 2016
Abnormal mismatch negativity for pure-tone sounds in temporal lobe epilepsy
Miho Miyajima1, Katsuya Ohta2, Keiko Hara3
1Section of Liaison Psychiatry and Palliative Medicine, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan; Hara Clinic, Kanagawa, Japan.
Epilepsy Research
|March 4, 2011
Summary
Temporal lobe epilepsy (TLE) patients show impaired auditory processing, specifically in pre-attentive sensory memory function. Event-related potential (ERP) analysis revealed delayed mismatch negativity (MMN) and mismatch positivity (MMP) in TLE individuals.
Area of Science:
- Neuroscience
- Epilepsy Research
- Auditory Neuroscience
Background:
- Temporal lobe epilepsy (TLE) is associated with complex neurological deficits.
- Auditory processing can be affected in TLE, but pre-attentive mechanisms require further investigation.
- Mismatch negativity (MMN) is a sensitive electrophysiological marker of auditory sensory memory.
Purpose of the Study:
- To investigate auditory processing abnormalities in TLE using mismatch negativity (MMN) and mismatch positivity (MMP).
- To assess pre-attentive sensory memory function in TLE patients compared to healthy controls.
Main Methods:
- A passive oddball paradigm with sinusoidal tones was used to elicit MMN and MMP.
- Event-related potentials (ERPs) were recorded from 20 TLE patients and 20 healthy controls.
- Analysis focused on MMN at frontocentral sites and MMP at mastoid sites.
Main Results:
- TLE patients exhibited enhanced frontocentral MMN compared to controls.
- MMN and MMP were significantly delayed in the TLE group.
- Greater positivity at mastoid sites for standard stimuli was observed in TLE patients, suggesting impaired neuronal adaptation.
Conclusions:
- TLE patients demonstrate impaired pre-attentive processing of pure-tone sounds.
- Enhanced MMN may indicate frontal lobe hyperexcitability compensating for temporal lobe dysfunction.
- MMN/MMP evaluation is a valuable tool for detecting pre-attentive auditory memory deficits in TLE.
