Reading focus
Syllabus: How Does Substance Use Become Persistent Despite Harm?
Track how the effort required for money changes choice while the nominal alternative remains the same.
Why you’re reading it. Test one concrete way in which opportunity can influence substance use.
A question to consider. What real-world barrier would resemble increased response cost, and what difference would prevent a simple translation from this experiment?
Why this reading
An alternative may exist without being equally accessible. Stoops and colleagues change the work required to obtain a monetary alternative while measuring cocaine choice. This makes the practical cost of an alternative, rather than its mere presence, available for experimental examination.
Before you read
A reinforcer is an outcome that maintains behavior under specified conditions. A fixed-ratio schedule requires a set number of responses to obtain it. A crossover design compares conditions within the same people, reducing some sources of between-person variation.
Read for
- Identify what remained constant and what changed across conditions. What does that permit a causal claim about?
- Compare average choice patterns with the size of the reduction. Responsiveness need not mean elimination of drug choice.
- Examine recruitment, the small alternative reward and the timing of payment. How might each shape the result?
Consider afterwards
- Design a comparison that separates the value of an alternative from the effort required to reach it.
- What would you need to observe before generalizing a laboratory choice effect to sustained change outside the laboratory?
Editorial context
Seven non-treatment-seeking adults completed the crossover study. Choices were sensitive to the response cost of money, but the effect was modest and drug choice remained common. Small sample size, selection, route of administration and delayed payment limit generalization. This was a laboratory experiment, not evidence that offering any alternative will resolve persistent harmful use or a direct comparison of treatments.