Figure 6.

All stressed groups show a similar and significant increase in serum corticosterone levels 15 min after swimming compared with unstressed animals. This increase is independent of being naive (intact stress) or being pretrained (intactp stress). No difference between stress levels or basal levels of corticosterone could be noted between sham-operated and lesioned animals (stress: intact, n = 8; pretrained, n = 8; sham, n = 4; lesioned, n = 9; base levels: intact, n = 6; sham, n = 3; lesioned, n = 10). Error bars represent means and SEM of serum corticosterone.