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Hearing assessment. A, Results from audiometric testing for 14/19 younger and 16/20 older participants. The solid gray line at 1300 Hz marks the frequency of the tones used in the current study. B, Histogram of sensation levels (for a 1300 Hz tone) for younger and older participant groups. Dots and error bars reflect the mean level and SEM, respectively, for each group (*p < 0.05). The sensation levels reflect dB values from the threshold estimation procedure written in MATLAB.
