Fig. 4.

Boxplots showing the proportion of positive responses made to tones during ambiguity tests by (a) rats (N = 6) and (b) mice (N = 3). The positive and negative training tones are 2 and 8 kHz (counterbalanced across subjects), and the intermediate tones are 3,4,5,6,7 kHz. Boxplots show medians, quartiles and ranges. Asterisks indicate points that are more than 3 inter-quartile ranges away from the upper or lower quartile.