Reading focus
Syllabus: What Changes During Adolescence?
Apply the preceding framework to a concrete manipulation. Evaluate the behavioral age-by-context test separately from each age group’s result, then assess what the brain measurements add.
A question to consider. Does a significant peer effect in adolescents and a nonsignificant effect in adults establish that the effects differ? Which comparison directly tests that claim?
Why this reading
Knowing that friends are watching may change a decision without explicit encouragement. Chein and colleagues manipulate that social context during a driving game. Their study invites separate evaluation of a behavioral effect and its proposed neural explanation.
Before you read
A within-person comparison tests the same participant in different conditions. An interaction asks whether a condition’s effect differs across groups. fMRI measures a blood-oxygen signal associated with neural activity; it does not directly measure a motive.
Read for
- Reconstruct the alone and peer conditions and what the task rewards.
- Compare the overall age-by-context interaction with the separate within-group tests.
- Distinguish the manipulated context from measured brain activity and alternative explanations.
Consider afterwards
- What additional experiment could distinguish heightened reward value from distraction when peers watch?
Editorial context
Analyses included 40 participants. The overall behavioral age-by-context interaction was not significant (p = .084), despite a significant adolescent within-group contrast. Neural interactions do not resolve that distinction or establish mediation. A later behavioral study examined known outcome probabilities; it does not independently establish this paper’s neural mechanism.