Increased Signal Complexity Improves the Breadth of Generalization in Auditory Perceptual Learning

Figure 4

Mean temporal duration discrimination thresholds (Δt/t for 79% correct performance) for the trained interval (90 ms/1 kHz), untrained frequency (90 ms/4 kHz), untrained stereo (90 ms/1 kHz), and untrained interval (220 ms/1 kHz). Circles represent pretest scores with triangles showing the posttest scores. Experimental groups are differentiated by colours (2 d training, filled, 4 d, diagonal stripes, and 10 d, chequered). Error bars indicate ±1 SEM. All groups improved on each condition from pre- to posttest, but there was only a significant group difference for generalization for the untrained duration condition where learning transfer was only found for the 10-day condition.