Chapter 17: Exercises

Comprehension Check

1. What was the serotonin hypothesis of depression? What evidence originally supported it?

2. What did the Moncrieff et al. (2022) umbrella review actually find? What did it NOT find?

3. Explain the difference between "the theory of the mechanism is wrong" and "the treatment doesn't work." Use the aspirin/fever analogy.

4. List three ways the chemical imbalance framing was useful and three ways it was harmful.

5. What does the Cipriani et al. (2018) meta-analysis tell us about antidepressant effectiveness? What are the key caveats?

Application

6. Ask three people what they think causes depression. Note whether they mention the chemical imbalance theory, psychological factors, social factors, or some combination. How does their understanding compare to the current evidence?

7. Find three news articles about the Moncrieff review. Compare how each frames the findings: - Does the article distinguish between "the serotonin theory is unsupported" and "antidepressants don't work"? - Does it mention that antidepressant effectiveness is supported by separate evidence? - Does it acknowledge the biopsychosocial model?

8. Apply the toolkit to the claim: "Depression is just a chemical imbalance, like diabetes is an insulin imbalance." Evaluate the analogy — in what ways is it accurate, and in what ways is it misleading?

9. If you or someone you know takes antidepressants, review the medication information sheet. Does it mention the chemical imbalance theory? How is the mechanism described? How does this compare to the current evidence?

10. The chapter describes the biopsychosocial model (biological + psychological + social factors). For each factor, give two specific examples of how it might contribute to depression. How does this multi-factor model compare to the single-cause "chemical imbalance" explanation?

Critical Thinking

11. The chemical imbalance theory was widely communicated to patients for 30+ years despite being oversimplified. What responsibility do pharmaceutical companies, medical schools, and prescribing doctors bear for communicating an inaccurate model?

12. Some argue that the chemical imbalance theory was worth communicating because it reduced stigma, even though it was wrong. Is there a precedent for communicating inaccurate science to achieve social good? What are the ethical implications?

13. The Moncrieff review was covered extensively in anti-psychiatry and anti-medication communities, which used it to argue that antidepressants are useless. How can accurate science communication prevent findings from being weaponized by ideological movements?

14. If we don't fully understand how antidepressants work (the mechanism takes 4–6 weeks despite serotonin increasing within hours), should this uncertainty be communicated to patients? How would you explain it?

15. The chapter argues that "the harmful oversimplification runs both ways." What does this mean? Give an example of harm from each direction (over-trust in the chemical imbalance model AND over-reaction against it).

Fact-Check Portfolio

16. If any of your 10 claims involve depression causes, brain chemistry, or medication: - Does the claim present a single-cause explanation? - Does it conflate mechanism with effectiveness? - Does it account for the biopsychosocial model? - Update your evidence rating.