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Mean pre-test (open symbols) and post-test (filled symbols) thresholds of the trained listeners (n = 9; squares) and controls (n = 9; triangles) for each of the six conditions. Threshold refers to the modulation depth needed to distinguish an amplitude-modulated from an unmodulated noise (SAM-detection) or to the difference in modulation rate needed to distinguish a faster from a slower rate (rate discrimination) on 79% of trials. Error bars reflect ± one standard error of the mean.
