Figure 2.

Subjective ratings of Mental Demand, Perceived Effort, Task Difficulty, Frustration, and Performance for each competing signal condition (none, single-talker speech, speech-shaped noise). Larger values indicate greater task demands and poorer performance. The ends of the whiskers indicate the 10th and 90th percentile, the boundaries of each box indicate the first and third quartile, and the line in the middle of each box indicates the median. Filled circles indicate the mean, and asterisks indicate significant post hoc pairwise comparisons.