Bryson was three when his neighbor's house burned down. he heard the loud sirens and saw the fire and trembled with fear. now he's starting preschool. he hears the loud bell ring and associates it with the fire and fire trucks and begins to tremble. in this setting, the sound of the bell is:

a conditioned stimulus

Explanation:

Ivan Pavlov was a great psychologist who has discovered the theory of classical conditioning while experimenting with dogs and has given a few important terms in the theory including conditioned and unconditioned stimulus and response.

Conditioned stimulus: According to Pavlov's experiment on classical conditioning, the term conditioned stimulus is defined as a formerly neutral stimulus after getting connected with an unconditioned stimulus gives rise to a conditioned response.

In the question above, the statement signifies that the sound of the bell is a conditioned stimulus.

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