Figure 5.

Experiment 2 – Square Pool. The upper graphs (A and B) show performance on the first Probe Test (60 s) after passive training in the pool with two black walls and two white walls. A) Percent of the 60s swim probe spent in the correct and incorrect locations. B) Ratio of time spent in correct over incorrect corner. The lower graphs (C and D) show performance during and after active training, that is, being allowed to swim to the escape location. C) Acquisition performance measured by latency to escape over successive days of training. D) Performance on Probe Test (60 s) after active training showing clear corner preferences. The vignettes show that for A (and for B and D) the platforms are removed, whereas for C the platforms are present. Data shown are group means, whereas the vertical bars are the standard error of the means (SEM).