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Vocoding reduces fundamental frequency magnitude across groups (P < 0.001). Group average spectral magnitudes for unprocessed and vocoded stimuli in young normal-hearing (YNH), older normal-hearing (ONH), and older hearing-impaired (OHI) listeners for both DISH and DITCH stimuli. YNH: unprocessed = blue, vocoded = cyan; ONH: unprocessed = red, vocoded = pink; OHI: unprocessed = black squares, vocoded = gray squares
