Chapter 13: Exercises

Comprehension Check

1. Explain the difference between dopamine's actual function (prediction, motivation, learning) and the popular "pleasure chemical" label. Why does this distinction matter?

2. What is the reward prediction error model (Schultz)? How does it differ from "dopamine = pleasure"?

3. Explain Berridge and Robinson's distinction between "wanting" and "liking." How does this distinction undermine the "dopamine detox" concept?

4. What did Cameron Sepah actually propose with "dopamine fasting"? How did the viral version distort his original concept?

5. What is the "pop neuroscience problem"? Give three examples of complex behaviors being reduced to a single neurotransmitter name.

Application

6. Find three "dopamine detox" videos on YouTube. For each, note: - Does the creator understand what dopamine actually does? - Do they claim the detox literally "resets" brain chemistry? - Do they distinguish between Sepah's behavioral proposal and the pseudoneuroscience version? - What product or channel are they promoting?

7. Apply the "pop neuroscience test" to the claim "social media is addictive because of dopamine." Rewrite the claim without any neuroscience language. Does the non-neuroscience version identify the actual mechanisms (variable reinforcement, social reward, notification design)?

8. List five functions of serotonin beyond mood regulation. For each, explain why calling serotonin "the happiness chemical" is misleading.

9. The chapter describes environmental design as an evidence-based alternative to dopamine detox. Identify three changes you could make to your own environment to reduce impulsive phone use. Note: these are behavioral strategies, not neurochemical ones.

10. A friend says "I did a dopamine detox this weekend — no phone, no social media, no sugar. I feel so much better! My dopamine receptors are reset." Using what you've learned, how would you respond? (Consider: they may genuinely feel better, even though the neurochemical explanation is wrong.)

Critical Thinking

11. If dopamine detox doesn't work through the neurochemical mechanism claimed, but people who try it often report feeling better, what alternative explanations could account for the subjective improvement?

12. The pop neuroscience problem involves naming a chemical and treating the name as an explanation. Can you think of other domains where this "naming = explaining" error occurs? (Consider: genetics, economics, philosophy.)

13. Sepah proposed a reasonable behavioral intervention that was distorted by the pipeline into pseudoscience. Could Sepah have prevented this distortion? What could researchers do to protect their ideas from viral misrepresentation?

14. ADHD medications work partly by increasing dopamine availability. Does this support the "dopamine = motivation" model? Why or why not?

15. The chapter argues that "naming a brain chemical doesn't explain a behavior." But isn't identifying the neurochemical mechanism a step toward explanation? Where is the line between useful neuroscience and pop neuroscience?

Fact-Check Portfolio

16. If any of your 10 claims involve neurotransmitters, brain chemistry, or neurochemical "hacks": - Does the claim reduce a complex system to a single chemical? - Would the claim survive if you replaced the chemical name with "brain stuff"? - Is there an evidence-based behavioral alternative to the neurochemical claim? - Update your evidence rating.