Module 4 Homework AssignmentName Institutional affiliationModule 4 Homework AssignmentDerrick was sitting with his friend Marcus on a bench next to a tall stone wall. The two were discussing their trip to the zoo when the when the wall suddenly came down. Derrick managed to escape in time, but Marcus was hit by a brick, that his tibia bone fractured and became visible. On seeing this sight, Derrick began to scream. Soon, the neighbors were there, and they called for an ambulance and Marcus was taken to hospital. Since that event, the two friends never sit next to wall.In the above scenario, seeing the bone protrude out of Marcus’ leg was an unconditioned stimulus which provoked Derrick to scream on top of his voice. However, Derrick has never sustained a broken human bone. This was the first fracture he had seen in his entire life, but he could understand the pain his friend was going through. His reaction was natural and unconditioned. The protruding bone on the other hand is an unconditioned stimulus(Chance & Krause, 2009).Annabel was a master’s student at Yale University. Her mother was the president of a