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ABR thresholds were determined before (pre) and immediately (imm) after noise exposure (1 kHz, 105 dB SPL, for 24 h) in a group exposed to noise (Left) and a group treated with MK801 before noise exposure (Right). A threshold shift of approximately 45 dB at 1, 4, and 8 kHz and 25 dB at 12 kHz was found for the untreated noise group, whereas pretreatment with MK801 resulted in a 25-dB threshold shift at 1 and 4 kHz. At 8 and 12 kHz the threshold shift was about 5 dB.
