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Hypothetical psychometric functions of speech recognition task (solid curves, refer to the left y-axis) and reaction-time task (dashed curves, refer to the right y-axis) for older (thicker black curves) and younger (thinner gray curves) listeners. Dark gray rectangle represents the signal-to-noise ratio used in the study. Light gray rectangle indicates the signal-to-noise ratio that corresponds to the steep portion of older listeners’ functions.
