Direct comparison between properties of adaptation of the auditory nerve and the ventral cochlear nucleus in response to repetitive clicks
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Meyer, Kaspar
Unit of Physiology, Department of Medicine, University of Fribourg, Switzerland
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Rouiller, Eric M.
Unit of Physiology, Department of Medicine, University of Fribourg, Switzerland
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Loquet, Gérard
Unit of Physiology, Department of Medicine, University of Fribourg, Switzerland
Published in:
- Hearing Research. - 2007, vol. 228, no. 1-2, p. 144-155
English
The present study was designed to complete two previous reports [Loquet, G., Rouiller, E.M., 2002. Neural adaptation to pulsatile acoustical stimulation in the cochlear nucleus of the rat. Hear. Res. 171, 72–81; Loquet, G., Meyer, K., Rouiller, E.M., 2003. Effects of intensity of repetitive acoustic stimuli on neural adaptation in the ventral cochlear nucleus of the rat. Exp. Brain Res. 153, 436–442] on neural adaptation properties in the auditory system of the rat. Again, auditory near-field evoked potentials (ANEPs) were recorded in response to 250-ms trains of clicks from an electrode chronically implanted in the ventral cochlear nucleus (VCN). Up to now, our interest had focused on the adaptive behavior of the first one (N₁) of the two negative ANEP components. A re-examination of our data for the second negative component (N₂) was now undertaken. Results show that the adaptation time course observed for N₂ displayed the same three-stage pattern previously reported for N₁. Similarly, adaptation became more pronounced and occurred faster as stimulus intensity and/or repetition rate were increased. Based on latency data which suggest N₁ and N₂ to be mainly due to the activity of auditory-nerve (AN) fibers and cochlear nucleus neurons, respectively, it was concluded that neural adaptation assessed by gross-potentials was similar in the AN and VCN. This finding is meaningful in the context of our search to restore normal adaptation phenomena via electro-auditory hearing with an auditory brainstem implant on the same lines as our work in cochlear implants.
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Faculty
- Faculté des sciences et de médecine
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Department
- Département de Médecine
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Language
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Classification
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Biological sciences
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License
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License undefined
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Identifiers
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Persistent URL
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https://folia.unifr.ch/unifr/documents/300339
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