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Deficient auditory interhemispheric transfer in patients with PAX6 mutations
Doris-Eva Bamiou1, Frank E Musiek, Sanjay M Sisodiya
1Neuro-otology Department, National Hospital for Neurology and Neurosurgery, London, United Kingdom. doris-eva.bamiou@uclh.org
Annals of Neurology
|September 25, 2004
Summary
Mutations in the PAX6 gene impair auditory processing by affecting interhemispheric transfer. Patients with PAX6 mutations show deficits in central auditory function, linked to corpus callosum and anterior commissure abnormalities.
Area of Science:
- Neuroscience
- Genetics
- Auditory Processing
Background:
- PAX6 mutations are linked to structural brain abnormalities, including the anterior commissure and corpus callosum.
- These brain structures are crucial for interhemispheric communication, particularly for auditory information.
Purpose of the Study:
- To investigate central auditory function in individuals with PAX6 mutations.
- To correlate auditory processing deficits with observed structural brain differences.
Main Methods:
- Central auditory tests (dichotic speech, pattern, gaps in noise) were administered to eight PAX6 subjects and eight controls.
- Brain MRI was used to assess the anterior commissure and corpus callosum structure in PAX6 subjects.
Main Results:
- PAX6 subjects exhibited abnormal results in tests requiring interhemispheric transfer, unlike controls.
- Lower left ear scores in dichotic speech tests were observed in PAX6 subjects.
- Structural abnormalities (absent/hypoplastic anterior commissure, hypoplastic corpus callosum) were present in most PAX6 subjects.
Conclusions:
- PAX6 mutations are associated with deficient auditory interhemispheric transfer.
- Abnormalities in the anterior commissure and corpus callosum likely contribute to auditory processing deficits.
- PAX6 plays a neurodevelopmental role in higher-order auditory processing.