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Does long-term unilateral deafness change auditory evoked potential asymmetries?
Jemma Hine1, Roger Thornton1, Anne Davis2
1Medical Research Council, Institute of Hearing Research, Royal South Hants Hospital, Southampton SO14 OYG, United Kingdom.
Summary
Long-term profound unilateral deafness did not alter auditory cortex hemispheric asymmetries. Brain activity in deaf patients showed similar patterns to controls, suggesting no significant cortical reorganization.
Area of Science:
- Neuroscience
- Auditory Neuroscience
- Neurophysiology
Background:
- Profound unilateral deafness can affect auditory processing.
- Investigating cortical adaptations in deafness is crucial for understanding brain plasticity.
Purpose of the Study:
- To examine long-term changes in auditory evoked potential (AEP) asymmetries in the auditory cortex of individuals with profound unilateral deafness.
Main Methods:
- Used 68-channel electroencephalography (EEG) to record auditory cortex responses to monaural stimulation.
- Analyzed N100 and middle latency response (MLR) ranges using source localization and asymmetry indices.
Main Results:
- Auditory cortex responses in unilaterally deaf patients were similar to audiogram-matched controls and normally hearing participants.
- No significant differences in hemispheric asymmetry indices were found between groups.
Conclusions:
- Long-term profound unilateral deafness does not lead to systematic changes in auditory cortical hemispheric asymmetries.
- The brain may reorganize to a typical pattern over time, masking long-term effects.
