FIGURE 6.

(H1) The active noise reduction (NR) scheme enhances the neural representation of attended speech to when the NR is inactive and across low and high signal-to-noise ratio (SNR) levels. Boxplots showing the reconstruction accuracy values of the attended speech envelope reconstructed from the attended talker decoder for two SNR levels tested with NR scheme inactive (OFF) or active (ON; left column) for global averages across NR schemes (middle column) and for global averages across SNR levels (right column). A significant main effect of NR scheme setting, indicating the enhanced neural representation of the attended speech when NR scheme was active, was observed. Significant differences in reconstruction performances between inactive and active NR in the pairwise comparison at each SNR level were observed. The horizontal lines in yellow denote single participants and the horizontal lines in black depict predictions of linear mixed models. The black horizontal line in the boxplot denotes the mean reconstruction accuracy of the attended speech envelope and the box indicates the upper and the lower quartiles, with the vertical lines representing the minimum and the maximum reconstruction accuracy values. The asterisks indicate significant differences (*p < 0.05, **p < 0.01); ns, not significant.