Kathy's heart rate increases every time she goes down a certain hallway at school. The boy that she likes has his locker in that hallway, and he often stands beside his locker and talks with his friends. In this scenario, what is most likely the unconditioned stimulus?

The correct answer is The hallway where the boy’s locker is located

Explanation: In classical conditioning, the unconditioned stimulus (US) is one that unconditionally causes a natural and automatic response. For example, Kathy's heart rate increases every time she goes down a certain hallway at school.

The unconditioned response is the naturally occurring response to the unconditioned stimulus.

propioception;