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Figure 2: Noise-induced shift in hearing threshold. In a different experiment, separate groups of mice were noise-exposed using the same equipment and protocol. Auditory brain stem response was tested prior to noise exposure and 11 days postnoise exposure to assess the permanent noise-induced threshold shift. The graph illustrates the shifts in the threshold detected by auditory brainstem responses recorded at 8, 16, and 32 kHz in mice exposed to 110 dB SPL (n = 8) and 116 dB SPL (n = 6) noise (for one hour) in comparison to control (n = 7). Note that the 110 dB exposure produces a smaller threshold shift than the 116 dB exposure. The results are expressed as mean ± standard deviation

Figure 2: Noise-induced shift in hearing threshold. In a different experiment, separate groups of mice were noise-exposed using the same equipment and protocol. Auditory brain stem response was tested prior to noise exposure and 11 days postnoise exposure to assess the permanent noise-induced threshold shift. The graph illustrates the shifts in the threshold detected by auditory brainstem responses recorded at 8, 16, and 32 kHz in mice exposed to 110 dB SPL (<i>n</i> = 8) and 116 dB SPL (<i>n</i> = 6) noise (for one hour) in comparison to control (<i>n</i> = 7). Note that the 110 dB exposure produces a smaller threshold shift than the 116 dB exposure. The  results are expressed as mean ± standard deviation