3. if a classically conditioned response has been extinguished then the unconditioned stimulus is paired with the conditioned stimulus again, conditioning will occur must faster the second time. this process is called?

Spontaneous recovery.

Explanation:

If a classically conditioned response has been extinguished then the unconditioned stimulus is paired with the conditioned stimulus again, this process is called spontaneous recovery. Spontaneous recovery is the reappearance of the conditioned response after a period in which the response has been extinguished. If further conditioning does not take place the conditioned response will be weaker.

answer; observing;