Abstract
At low intensities (< 60 dB SPL), the amplitude of the auditory brain stem evoked response (ABR) is a linear function of signal intensity. Above 60–70 dB SPL response amplitudes decline, sometimes dramatically, and reach a minimum at 80–90 dB SPL. Above 80–90 Db SPL, ABR wave amplitudes increase rapidly. These features are represented in all ABR components with the effect being most pronounced in waves I and V. The nonmonotonic ABR amplitude behavior exists at high intensities (> 100 dB SPL) in kittens less than four postnatal weeks old, and is more pronounced in kittens less than three to four months of age than in adult animals. Also, nonmonotonic behavior disappears for some time following exposure to a high-intensity sound. Nonmonotonic growth of ABR amplitude is in many respects similar to that observed in responses of auditory nerve fibers. [Work supported by NINCDS grant NS-14880 and by a Biomedical Research Supplement Grant from NIH.]
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