Figure 1.

Across-session performance on the trained backward-masking condition. (a)–(c) Mean results by age group: mean signal detection thresholds (dB for 94.2% correct) for the trained (filled circles) and control (open circles) groups at the pre- and post-tests, and for the trained groups during the training phase. Results are shown separately for the (a) adults (≥18 years of age), (b) older adolescents (13 years, 4 months–17 years, 1 month), and (c) younger adolescents (11 years, 0 months–13 years, 2 months). Trained groups: adults, n = 11; older adolescents, n = 11; younger adolescents, n = 9. Control groups: adults, n = 19; older adolescents, n = 13; younger adolescents, n = 15. (d) Learners vs non-learners: mean signal detection thresholds for the combined group of younger and older adolescents, divided into learners (filled triangles, n = 10), worseners (filled hourglasses, n = 6), and non-learners (filled squares, n = 4) based on each listener's performance across all 12 sessions. Error bars indicate +/− one standard error. Only the upper or lower error bar is shown when the error bars overlapped between groups.