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Brainstem auditory response in the reserpinized rat
José De Jesús Morales-Martinez1, Rigoberto González-Piña, Alfonso Alfaro-Rodríguez
1Laboratorio de Neurofisiología Auditiva, CNR-InCH, México City. j1503@hotmail.com
Proceedings of the Western Pharmacology Society
|November 19, 2002
Summary
Catecholamines, such as dopamine and norepinephrine, play a role in auditory signal transmission through the brainstem. This study found that reserpine, which affects catecholamine levels, altered brainstem auditory evoked potentials in rats.
Area of Science:
- Neuroscience
- Auditory Neuroscience
- Pharmacology
Background:
- The brainstem auditory evoked potential (BAEP) reflects auditory signal transmission in the brainstem.
- Catecholamines (CA) are present in the cochlea and auditory pathway, but their role in BAEP is unclear.
Purpose of the Study:
- To investigate the role of catecholamines in the brainstem auditory evoked potential (BAEP) pattern.
- To determine if catecholamine depletion affects auditory signal processing in the brainstem.
Main Methods:
- BAEPs were recorded from anesthetized Wistar rats.
- Reserpine was administered to deplete catecholamines.
- BAEPs were recorded before and after reserpine injection over 75 minutes.
Main Results:
- Reserpine administration significantly increased the latency of waves III, IV, and V in the BAEP.
- These findings indicate alterations in neural signal transmission speed.
Conclusions:
- Dopamine and norepinephrine are implicated in electrical transmission within the superior olivary complex, lateral lemniscus, and inferior colliculus.
- Catecholamines are crucial for normal auditory processing at specific brainstem levels.