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Frequency–response functions at suprathreshold sound levels show evidence for cochlear synaptopathy at some frequencies. (A–D) Response functions in response to 2, 4, 8 or 16 kHz tones, normalized to threshold for each animal (0 dB SL). Significantly higher or lower responses are indicated by blue asterisks (** p < 0.008, * p < 0.02). Pale symbols indicate levels with low n’s. Error bars are SEM.
