Optimum primary tone level setting for measuring high amplitude DPOAEs in guinea pigs

Long-term administration of magnesium after acoustic trauma caused by gunshot noise in guinea pigs

“…The levels of the primary tones were 65 dB SPL for f2 and 60 dB SPL for f1, and the ratio f2/f1 was set at 1.20. The stimulus parameters were chosen according to published data about DPOAEs in guinea pigs (Michaelis et al, 2003). Data are described with respect to f2 frequency since the generator site of the 2f1-f2 distortion product has been most closely correlated with the f2 frequency place in the cochlea (Brown and Kemp, 1984).…”

Comparing the optimal signal conditions for recording cubic and quadratic distortion product otoacoustic emissions

“…From Eq. ͑7͒, the calculated values of L 1 and f 2 / f 1 are well comparable with results in humans ͑Kummer et al., 2000;Johnson et al, 2006͒ androdents ͑Pibal et al, 2002;Michaelis et al, 2004͒. Parameters used in the formulas still need to be tested and refined by large-scaled studies with wider stimulus ranges.…”

Middle ear and cochlear disorders result in different DPOAE growth behaviour: implications for the differentiation of sound conductive and cochlear hearing loss

“…Animals of group B were included in another study (not shown) with already determined f 2 frequencies, therefore the frequency values are not completely identical among groups. DPOAE I/Ofunctions were recorded with a guinea pig specific stimulus paradigm (Michaelis et al, 2003) to achieve maximum DPOAE levels at different stimulus intensities. L 2 ranged between 15 and 60 dB SPL with L 1 ¼ 0:46 L 2 þ 41 dB SPL and a step size of 5 dB.…”