To assess whether mrs. webster had suffered a brain injury, researchers conditioned her to blink in response to a sound that signaled the delivery of a puff of air directed toward her face. in this application of classical conditioning, the sound was a(n)
a) unconditioned stimulus.
b) unconditioned response.
c) conditioned stimulus.
d) conditioned response.

c) conditioned stimulus.  

Explanation:

Conditioned stimulus: The term conditioned stimulus is a part of the classical conditioning, which is proposed by the behavioral psychologist named Ivan Pavlov. It is defined as a formerly neutral stimulus that after being associated with an unconditioned stimulus triggers a conditioned response. Here, the neutral stimulus doesn't produce any reaction.

In the question above, the sound was a conditioned stimulus.

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because he is that the right