Figure 2. Discrimination performance for the pigeons in Experiment 1 across all three phases of training, testing, and baseline, using ρ (rho) as a discrimination performance metric (see text for more information).

Filled symbols represent dynamic performance and open symbols represent static performance. The left panel depicts the successful discrimination acquisition of the behaviors as ρ increased from a chance level of 0.5. The middle panel depicts discrimination during transfer sessions testing two novel exemplars of the behaviors. The rightmost panel shows the pigeons' stable discrimination behavior after the addition of the novel exemplars to daily training. Error bars depict standard error.