Köppl, 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.
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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.
|Institutions:||Medicine > Lehrstuhl für Hals-Nasen-Ohren-Heilkunde|
|Subjects:||500 Science > 570 Life sciences|
500 Science > 590 Zoological sciences
600 Technology > 610 Medical sciences Medicine
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Partially|
|Deposited On:||18 Jun 2009 14:44|
|Last Modified:||05 Aug 2009 13:57|