Manley, Geoffrey A. and Kaiser, Alexander and Brix, Jutta and Gleich, Otto
Activity patterns of primary auditory-nerve fibres in chickens: Development of fundamental properties.
Hearing Research 57 (1), pp. 1-15.
Other URL: http://www.sciencedirect.com/science/journal/03785955
We have examined the activity patterns of single auditory-nerve fibres in the chicken and tested for possible changes during post-hatching development. For this purpose, we recorded from fibres in the cochlear ganglion of chickens of two age groups (about P2 and P21) and investigated their spontaneous and sound-evoked activity patterns under nembutal-chloralhydrate anaesthesia. The spontaneous activity of primary auditory neurones was irregular, the average rates were between 20.5 (P2) and 23 (P21) spikes/s. Many low-frequency fibres from both age groups showed preferred intervals in their spontaneous activity. Tuning characteristics, including the range of characteristic frequencies, the presence of primary and two-tone suppression, the slopes of tuning-curve flanks and Q10dB
values were similar to those previously reported for
the starling and were statistically indistinguishable between the two age groups. However, there was a difference in fibre thresholds at the highest frequencies. Systematic differences were also present between the two age groups with regard to some characteristics of the rate-intensity
functions. These data indicate that whereas the tuning properties of primary auditory fibres of the chicken cochlea are mature as early as post-hatching day 2, the intensity functions are not.
|Institutions:|| Medicine > Lehrstuhl für Hals-Nasen-Ohren-Heilkunde|
|Keywords:||Development; Chicken; Primary auditory neurones; Cochlear ganglion; Auditory physiology; Bird|
|Subjects:||500 Science > 590 Zoological sciences|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||No|
|Deposited On:||05 Jun 2008 12:56|
|Last Modified:||20 Jul 2011 21:15|