Chapter 6 Exercises: The Neuroscience of Desire

Exercise 6.1 — The "Love Is Just Chemistry" Debate

Format: Written argument (500–700 words) | Difficulty: Intermediate

The Claim: A popular wellness influencer posts the following: "Scientists have proven that love is nothing more than a cocktail of brain chemicals — dopamine, oxytocin, and serotonin. Once you understand this, you realize 'falling in love' is just your brain playing tricks on you. True love is a choice, not a feeling."

Your Task:

Using specific evidence from this chapter, write a structured response that does the following:

1. Identify what is accurate in the influencer's claim. What neurochemical and neuroimaging evidence does legitimately support the idea that romantic love involves identifiable biological mechanisms? Be precise — name the neurotransmitters, brain regions, and relevant studies.

2. Identify what is oversimplified or wrong. The claim that love is "just" chemistry involves at least three conceptual errors. Name them, explain each, and cite chapter evidence. Consider: the levels-of-explanation problem, the distinction between correlation and determinism, and the role of cultural context in shaping what our brain circuits respond to.

3. Engage with the final sentence — "True love is a choice, not a feeling." Does the neuroscience support a hard distinction between choice and feeling here? What does the deactivation of prefrontal critical-evaluation regions during early love suggest about the relationship between deliberate choice and neurobiological state? Is this a dichotomy or a spectrum?

Evaluation Criteria: Does your response demonstrate understanding of specific neurochemical systems? Does it avoid both dismissing neuroscience as irrelevant and treating it as wholly determining? Is your argument clearly structured?

Exercise 6.2 — Comparative Neuroimaging Study Analysis

Format: Comparative analysis table + short written response (400–500 words) | Difficulty: Advanced

Overview: Neuroimaging research on romantic love raises significant methodological questions. This exercise asks you to apply the methodological criteria discussed in Section 6.7 to two studies.

The Studies:

• Study A: Fisher, Aron, Mashek, Li & Brown (2005). "Defining the Brain Systems of Lust, Romantic Attraction, and Attachment." Archives of Sexual Behavior. (n=17, fMRI, photographs of romantic partners vs. acquaintances, participants rated 7.4 months into relationships)

• Study B: Xu et al. (2011). "Regional brain activity during early-stage intense romantic love predicted relationship outcomes after 40 months: An fMRI assessment." Neuroscience Letters. (n=18, Chinese sample, fMRI, 40-month follow-up)

Part A — Analysis Table

For each study, complete the following comparison table:

Part B — Written Response

After completing the table, write 3–4 paragraphs addressing: What do these two studies, considered together, tell us with reasonable confidence about the neuroscience of early romantic love? What remains uncertain? What would a methodologically stronger study design look like — and what practical or ethical constraints might make that design difficult to execute?

Exercise 6.3 — Personal Reflection: Does Knowing Change the Feeling?

Format: Reflective essay (300–400 words) | Difficulty: Accessible | Note: This exercise is ungraded and not submitted — it is for your own reflection only. Instructors may invite voluntary discussion.

Background: One tension in teaching the neuroscience of love is the worry that explaining desire in biological terms might somehow diminish the experience — that knowing your racing heart is "just" norepinephrine makes it feel less meaningful. Philosophers call this the "nothing but" fallacy: describing something at a lower level of explanation and concluding it is "nothing but" that lower level.

Prompt Questions (you do not need to answer all of these — use them as starting points):

1. If you have experienced the early, intense phase of romantic attraction, does the description in this chapter (dopaminergic wanting, serotonin-mediated preoccupation, PFC deactivation) feel accurate to what you experienced? Does any part of it feel like a misrepresentation?

2. Does knowing the neurobiological story change how you interpret that experience — or how you would act within it? Why or why not?

3. Is there something about your own experience of attraction or attachment that the neurobiological account in this chapter seems unable to capture? What is it, and what kind of explanation might do it better?

4. The chapter argues that "the dopamine system doesn't determine behavior, it shapes motivation." What do you think is the difference between a neurobiological system shaping your motivation and it determining your behavior? In practice, how large does that distinction feel?

Note for reflection: There are no correct answers here. The goal is to develop the habit of using theoretical frameworks as lenses for examining experience, rather than as verdicts about experience.

All written exercises should use APA 7 in-text citation format where applicable. Include a brief reference list at the end of any exercise that cites specific studies.