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Average spontaneous firing rate (SFR) ± SEM in the three groups, divided according to CF region. White bars, CF ≤ 8 kHz; gray bars, CF ≥10 kHz. *p < 0.05; **p < 0.01; ***p < 0.001. Numbers of neurons in each group are shown inside histogram bars. SFR was significantly elevated relative to shams in both CF regions in acoustic trauma, but only in the CF ≥10 kHz region in mechanical lesions.
