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Speech recognition score (1A), reaction time (RT) of the secondary task (1B and 1C), and subjective listening effort rating (D) averaged across participants as a function of signal-to-noise ratio (SNR) of Experiment 1. In Figure 1C the y-axes of the RT curves are rescaled so that the curves of the easy task (refer to the left y-axis) and the hard task (refer to the right y-axis) have similar peak heights in the figure. Error bars = 1 SE.
