section_path: Research/Models/Predator-based psychosocial stress
section_name: Predator-based psychosocial stress
paragraph_text: Predator-based psychosocial stress
  
  Predator-based psychosocial stress (PPS) involves a more naturalistic approach to fear learning. Predators such as a cat, a snake, or urine from a fox or cat are used along with other stressors such as immobilization or restraint in order to generate instinctual fear responses.