Auditory brainstem responses in adult budgerigars (Melopsittacus undulatus)

The auditory brainstem response (ABR) was recorded in adult budgerigars (Melopsittacus undulatus) in response to clicks and tones. The typical budgerigar ABR waveform showed two prominent peaks occurring within 4 ms of the stimulus onset. As sound-pressure levels increased, ABR peak latency decrease...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2002-09, Vol.112 (3 Pt 1), p.999-1008
Main Authors: Brittan-Powell, Elizabeth F, Dooling, Robert J, Gleich, Otto
Format: Article
Language:English
Subjects:
Acoustic Stimulation
Animals
Auditory Threshold - physiology
Brain Stem - physiology
Cochlear Microphonic Potentials - physiology
Evoked Potentials, Auditory, Brain Stem - physiology
Habituation, Psychophysiologic - physiology
Loudness Perception - physiology
Parrots - physiology
Pitch Discrimination - physiology
Reaction Time - physiology
Reference Values
Sound Spectrography
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Summary:The auditory brainstem response (ABR) was recorded in adult budgerigars (Melopsittacus undulatus) in response to clicks and tones. The typical budgerigar ABR waveform showed two prominent peaks occurring within 4 ms of the stimulus onset. As sound-pressure levels increased, ABR peak latency decreased, and peak amplitude increased for all waves while interwave interval remained relatively constant. While ABR thresholds were about 30 dB higher than behavioral thresholds, the shape of the budgerigar audiogram derived from the ABR closely paralleled that of the behavioral audiogram. Based on the ABR, budgerigars hear best between 1000 and 5700 Hz with best sensitivity at 2860 Hz-the frequency corresponding to the peak frequency in budgerigar vocalizations. The latency of ABR peaks increased and amplitude decreased with increasing repetition rate. This rate-dependent latency increase is greater for wave 2 as indicated by the latency increase in the interwave interval. Generally, changes in the ABR to stimulation intensity, frequency, and repetition rate are comparable to what has been found in other vertebrates.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.1494807