Table 1.

Comparison of performance between the control and noise-exposed rats in a quiet and a noisy environment.

ΔFs		50%	40%	30%	20%	Grand Mean
Control (N = 9)	Quiet (n = 9)	78.3 ± 2.4	80.0 ± 2.2	86.1 ± 1.3	85.0 ± 4.4	81.3 ± 1.5
			***	***	***
	Noisy (n = 3)	73.6 ± 8.2	52.8 ± 14.5	64.8 ± 5.6	62.7 ± 7.2	62.4 ± 9.4
			**	***	***
Noise-exposed (N = 6)	Noisy (n = 6)	69.5 ± 3.5	72.0 ± 4.8	84.2 ± 4.1	84.9 ± 2.6	77.1 ± 4.9
	Quiet (n = 6)	78.8 ± 6.5	83.1 ± 3.8	80.1 ± 0.7	74.4 ± 3.2	79.7 ± 4.4

The letter n indicates that n out of N rats were tested in each condition (quiet or noisy environment). Each value (mean ± SEM) is the averaged hit rate across the tested rats for each ΔF. The asterisks indicate statistically significant difference between the two adjacent groups: [(control || quiet) vs. (control || noisy)] and [(control || noisy) vs. (noise-exposed || noisy)]. Number of asterisks indicates the level of significance of Mann–Whitney Rank Sum Test:

^**, P < 0.01;

^***, P < 0.001. The grand mean is the averaged hit rate across all the tested ΔFs for each experimental group (across row).