Pavlov placed meat powder in the mouths of dogs, and they began to salivate. The food acted as a (an) __________

A) unconditioned response.
B) unconditioned stimulus.
C) conditioned response.
D) conditioned stimulus.

Unconditioned Stimulus

An unconditioned stimulus is a stimulus that naturally triggers a response without the need for prior learning.

Conditioned Stimulus

A previously neutral stimulus that, after becoming associated with an unconditioned stimulus, eventually comes to trigger a conditioned response.

Meat Powder

In classical conditioning research, a substance used by Ivan Pavlov that triggered salivation in dogs as an unconditioned stimulus.