Studies by Schultz and colleagues suggest that release of dopamine within the nucleus accumbens
a. does not occur for an expected reinforcing stimulus (fruit juice).
b. is automatically produced during stimulus delivery.
c. is greatest for drugs of abuse.
d. is greatest for natural reinforcers.
e. can occur when a stimulus is aversive.
Answer: a. does not occur for an expected reinforcing stimulus (fruit juice).
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