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. Author manuscript; available in PMC: 2009 May 1.
Published in final edited form as: J Comp Psychol. 2008 May;122(2):132–145. doi: 10.1037/0735-7036.122.2.132

Figure 4.

Figure 4

The discriminability index (d′) as a function of training session by condition in Experiment 2. Participants in the Hard condition (n = 9) were trained with the critical contrast (11.5 vs. 12 sweeps/s) throughout the eight sessions, whereas those in the Easy condition (n = 9) were trained with progressively more similar contrasts as training sessions proceeded from 8 vs.12 sweeps/s (Session 1), to 10 vs. 12 sweeps/s (Sessions 2 and 3), 11 vs. 12 sweeps/s (Sessions 4 and 5), 11.3 vs. 12 sweeps/s (Sessions 6 and 7), and finally to the critical 11.5 vs. 12 sweeps/s (Session 8). Sessions with the same sound contrast are connected by a line in the figure. The solid curve labeled as ‘Log. (Hard)’ represents the logarithmic trend fitted to the learning curve of the Hard condition.