Fig. 5.

Neural tracking of the envelope as a function of speech understanding, measured in 54 normal-hearing adults using 2 speech materials (matrix and story) and 2 masker types (speech-weighted noise and a competing talker). Per speech material and masker, 4 data points are plotted per participant, representing the 4 subject-specific signal-to-noise ratio (SNR) conditions. In addition, 3 regression lines with confidence intervals (shaded areas) were fitted, representing the predicted data for an example person aged 28 (young), 50 (middle-aged), or 71 (older) yr (color-coded). Dashed black lines indicate the significance level of the measure for envelope tracking.