Koppl, Christine and Gleich, Otto (2007) Evoked cochlear potentials in the barn owl. JOURNAL OF COMPARATIVE PHYSIOLOGY A-NEUROETHOLOGY SENSORY NEURAL AND BEHAVIORAL PHYSIOLOGY, 193 (6). pp. 601-612. ISSN 0340-7594,
Full text not available from this repository. (Request a copy)Abstract
Gross electrical responses to tone bursts were measured in adult barn owls, using a single-ended wire electrode placed onto the round window. Cochlear microphonic (CM) and compound action potential (CAP) responses were evaluated separately. Both potentials were physiologically vulnerable. Selective abolishment of neural responses at high frequencies confirmed that the CAP was of neural origin, while the CM remained unaffected. CAP latencies decreased with increasing stimulus frequency and CAP amplitudes were correlated with known variations in afferent fibre numbers from the different papillar regions. This suggests a local origin of the CAP along the tonotopic gradient within the basilar papilla. The audiograms derived from CAP and CM threshold responses both showed a broad frequency region of optimal sensitivity, very similar to behavioural and single-unit data, but shifted upward in absolute sensitivity. CAP thresholds rose above 8 kHz, while CM responses showed unchanged sensitivity up to 10 kHz.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | BRAIN-STEM-RESPONSES; AUDITORY-NERVE; INNER-EAR; TYTO-ALBA; NUCLEUS MAGNOCELLULARIS; KANAMYCIN OTOTOXICITY; DISCHARGE PATTERNS; BASILAR PAPILLA; PHASE-LOCKING; ROUND WINDOW; hearing; auditory; bird; avian; basilar papilla |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Hals-Nasen-Ohren-Heilkunde |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 03 Dec 2020 11:54 |
| Last Modified: | 03 Dec 2020 11:54 |
| URI: | https://pred.uni-regensburg.de/id/eprint/32675 |
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