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Figure 1. Mean auditory [brainstem (inferior colliculus)-evoked potentials] thresholds obtained from young (n = 50) and aged Long-Evans rats (n = 52) before exposure. The young rats were 3 months old, and the aged rats were 25 months old. Half of the confidence intervals (95%) have been left out in the interest of clarity.

Figure 1. Mean auditory [brainstem (inferior colliculus)-evoked potentials] thresholds obtained from young (n = 50) and aged Long-Evans rats (n = 52) before exposure. The young rats were 3 months old, and the aged rats were 25 months old. Half of the confidence intervals (95%) have been left out in the interest of clarity.