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Cochlear Implant Surgery and Electrically-evoked Auditory Brainstem Response Recordings in C57BL/6 Mice
Published on: January 9, 2019
Changes in the cerebral blood flow in postlingual cochlear implant users
1Laboratory of Audiology and Vestibular Research, School of Medicine, Uruguay. hsuarez@chasque.apc.org
Acta Oto-Laryngologica
|May 13, 1999
Summary
Cochlear implants significantly increased regional cerebral blood flow (rCBF) in auditory areas. Speech processing also showed increased rCBF in frontal lobes, correlating with speech discrimination.
Area of Science:
- Neuroscience
- Audiology
- Medical Imaging
Background:
- Cochlear implants are vital for restoring hearing in postlingually deaf individuals.
- Understanding the neural changes post-implantation is crucial for optimizing auditory rehabilitation.
Purpose of the Study:
- To investigate changes in regional cerebral blood flow (rCBF) in cochlear implant users.
- To correlate neural activity with speech perception improvements.
Main Methods:
- Single photon emission tomography (SPECT) with Tc-99m ECD was used to measure rCBF.
- Five postlingually deaf patients with multichannel cochlear implants underwent auditory stimulation protocols before and after implantation.
- Stimuli included clicks and sequential Spanish sentences.
Main Results:
- Significant rCBF increases were observed in the primary left auditory cortex and right auditory cortex post-implantation.
- Hearing sequential sentences led to asymmetrical rCBF increases in the frontal lobes.
- Speech discrimination scores correlated with rCBF distribution in frontal and temporal lobes.
Conclusions:
- Cochlear implantation enhances neural activity in auditory processing areas.
- Complex auditory processing, like sentence comprehension, engages frontal lobe networks.
- rCBF patterns may reflect individual differences in speech processing and rehabilitation outcomes.
