Robert always looks downward in the presence of a police officer. This is most clearly an example of

a. dishabituation. b. stimulus control. c. spontaneous recovery. d. a positive contrast effect.

Answer:. b. stimulus control.

Explanation:

According to behavioral psychology, stimulus control refers to how an organism tend to change their behavior in the presence of a certain stimuli and return to another behavior in the absence of that stimuli.

Someone uses discriminative stimulus to refine their behaviour in response to a particular stimuli such as when Robert sees the police officer this is a behavior driven by knowing that this is an authority figure and is based on historical reinforcement.