Characteristics of auditory brainstem responses in ground squirrels.
Auditory brainstem responses (ABRs) were characterized at 37 degrees C in ground squirrels (Citellus lateralis) which were implanted with recording screws to record ABRs, and a thermistor to record brain temperature. After two weeks ground squirrels were reanesthetized and tone pips and clicks were delivered through a TDH-49 headphone. Recorded ABRs were found to vary in a predictable manner as a function of stimulus frequency and intensity. At intensities above 50 dB SPL, ABRs could be recorded over the range tested (2-32 kHz). An 8 kHz tone pip was the best frequency for recording ABRs at the lowest stimulus intensities. Latencies decreased as stimulus frequencies increased from 4 kHz to 32 kHz.
Hamill
N J
NJ
Department of Animal Physiology, University of California, Davis 95616.
McGinn
M D
MD
Horowitz
J M
JM
D000161:Acoustic Stimulation; D000818:Animals; D001309:Auditory Threshold / Q000502:physiology; D001933:Brain Stem / Q000502:physiology*; D005072:Evoked Potentials, Auditory; D005260:Female; D008297:Male; D012589:Sciuridae / Q000502:physiology*