Figure 7.

Performance (mean ± SEM) of the enriched and control Sprague–Dawley and Long Evans rats in FST. The behaviors were classified as active, passive, or other (see Figure 2 for descriptions). Frequency is plotted in the top 2 rows and duration in the bottom 2 rows, with Sprague–Dawley data above the Long Evans data. FST were conducted on 2 consecutive days (day 1, left; day 2, right). In the frequency data, strain-associated differences were found in each behavioral cluster and a treatment×day interaction in the analysis of other behaviors. Duration data showed a significant effect of treatment in active and other behaviors and a day×treatment interaction in other behaviors.