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Mean auditory [brainstem (inferior colliculus)-evoked potentials] thresholds obtained from 21-week ( ; n = 8) and 14-week groups ( ; n = 8) of Long-Evans rats before exposure. The best frequency sensitivity (10.8 dB SPL) is located at 24 kHz. Half of the confidence intervals (95%) have been left out in the interest of clarity.

Mean auditory [brainstem (inferior colliculus)-evoked potentials] thresholds obtained from
21-week ( ; n = 8) and 14-week groups ( ; n = 8) of Long-Evans rats before exposure. The best
frequency sensitivity (10.8 dB SPL) is located at 24 kHz.
Half of the confidence intervals (95%) have been left out in the interest of clarity.