Fig. 4. Freezing time is elevated in Stay mice during SAM interaction and can be increased by Orx2 receptor antagonism and decreased by Orx2 receptor agonism.
A) Mean (± SEM) contextual freezing time in vehicle treated Stay animals (solid dots) is significantly increased (*) compared to day one on days 2–4 of SAM interaction; and compared to vehicle treated Escape mice (square ‡) on injection day (3; arrow ‡). B) Mean (± SEM) % freezing time increases in all groups on day 2, compared to day 1, prior to treatment (+ significance in agonist treated animals, # significance in antagonist treated animals). Injection of Orx2 antagonist (icv; triangles) increased freezing on day 3 compared to day 1, day 2, and day 4, and icv Orx2 agonist (diamonds, arrow) significantly decreased freezing relative to vehicle (§) and antagonist treatments (†) on day 3 (arrow).