Figure 2.

(Upper) Mean (+SEM) plasma corticosterone levels in response to 10 min of noise stress. ENDO animals exhibit greater corticosterone stress responses and take significantly longer to return to basal levels compared with SALINE controls. *, P < 0.05 vs. SALINE. (Lower) The animals' behavioral responses to noise stress while in their home cages were also observed. Mean (+SEM) activity levels increased in both ENDO and SALINE animals in response to the noise stress. SALINE animals returned to baseline levels of activity within 10 min after stress exposure, whereas ENDO animals continued to exhibit increased activity. *, P < 0.05 vs. ENDO.