Figure 5. Conducting the shock-probe defensive burying test.

A. Blind-identification card is displayed to the camera before testing. B. Rat is placed into the end of the cage opposite the probe, facing away from the probe. C. Rat approaches the probe and receives a shock. D. After withdrawing from shock, the current is turned off and the 15 min scoring period begins, during which the rat may display immobility, displace bedding, i.e., bury, or engage in “other” behavior, e.g., exploration, grooming, etc., which is not scored (see Figure 6).