In trying to understand the psychology of addiction, dr. jackson focuses on the neurochemical changes that occur, dr. fong focuses on the consequences that people experience for their behavior, and dr. wenkle focuses on the cognitive processes that people use in choosing their actions. the different perspectives of these three professionals to illustrate the underlying theme that

Psychology is theoretically diverse.

Explanation:

The theme, 'Psychology is theoretically diverse' means that the psychology has many various views and points. This is because when people make many observations they can go several and many different ways with these observations. This is why Psychology has many perspectives. The differing perspectives provide complete understanding of the human behavior more effectively.

Hence, different perspectives of the three professionals mentioned illustrate this theme.

i don't know that i agree with that but what's the question ?