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Threshold (±SE) of the compound action potential (CAP) was elevated by MPTP treatment only at the highest frequencies tested. Asterisks indicate statistically reliable differences between control and MPTP-treated ears. CAP threshold was determined immediately after cementing the recording electrode in place, 30 min after applying artificial perilymph to the round window membrane, and 30 min after applying 50 mM MPTP to the round window membrane.
